rotorn.

Brit.

/ˈrəʊtə/, U.S.

/ˈroʊdər/

Origin: Formed within English, by clipping or shortening. Etymon: rotator n.

Etymology: Shortened < rotator n.In sense 6 after German Rotor (J. Küttner 1938, in Beiträge zur Physik der freien Atmosphäre 25 108).

1. Mathematics. In the terminology of W. K. Clifford: a quantity having magnitude, direction, and position, the simplest of which is a rotational velocity about an axis. Cf. motor n. 6. Now historical and rare.

ΘΚΠ

the world > relative properties > number > mathematical number or quantity > tensor > [noun] > rotor

rotor1873

rotator1879

1873 W. K. Clifford in London Math. Soc. Proc. 4 381 I propose to use the name rotor (short for rotator) to mean a quantity having magnitude, direction, and position, of which the simplest type is a velocity of rotation about a certain axis.

1882 Nature 6 July 218/2 Such a displacement is the same as a rotation about the polar of the given line, and is hence called by Clifford a Rotor.

1904 A. Jamieson Elem. Man. Appl. Mech. (ed. 6) i. 5b A localised vector is called a Rotor (Clifford).

2000 M. Shoham in M. Ceccarelli Proc. Internat. Symp. Hist. Machines & Mechanisms v. 177 In his work, Clifford distinguished between vectors..and rotors, which are entities having a magnitude, direction and position.

a. Electrical Engineering. The rotating part of a motor, dynamo, etc. Cf. stator n.² 1.

ΘΚΠ

society > occupation and work > equipment > machine > machines which impart power > motor > [noun] > other parts of

gear1814

controller1836

phonic wheel1878

reverser1879

rotor1892

stator1892

brush-holder1894

interpole1907

phonic motor1924

the world > matter > physics > electromagnetic radiation > electricity > electrical engineering > generator > [noun] > rotating part

rotor1892

1892 Electr. World 1 Oct. 209/3 There are two laminated so-called field magnets, or ‘stators’, as we may call them, each embracing a so-called armature or ‘rotor’.

1922 Pop. Sci. Monthly July 64/1 Rolling a 65-ton dynamo rotor ten miles over the road to a power house proved to be easier than delivering it on a special truck.

1969 E. P. Anderson Home Appliance Servicing (ed. 2) xvi. 255 In the induction motor, the mechanical force produced between the rotor and the stator by the current is transformed into mechanical power.

1987 E. H. J. Pallett Aircraft Electr. Syst. (ed. 3) i. 7/2 The generator or alternator as it is more generally called, consists of a rotor, stator, slip ring and brush assembly and end frames.

2010 N.Y. Times (Nexis) 7 Feb. (Automobiles section) 8 More powerful motors can be built by making the magnets of rare-earth metals like neodymium, which increases the rotor's magnetic flux.

b. Engineering. The rotating assembly in a turbine; = runner n.¹ 15. Cf. stator n.² 2.

ΘΚΠ

society > occupation and work > equipment > machine > machines which impart power > turbine > [noun] > parts of > other parts

runner1878

penstock1894

rotor1903

turbofan1911

spill burner1945

1903 U.S. Patent 729,215 1/1 Steam at this high velocity impinges on buckets or vanes formed to receive the impact and by deflection of flow secures reactive force upon the rotor.

1916 J. W. M. Sothern Marine Steam Turbine (ed. 4) viii. 424 The turbine consists of two principal parts, the rotor or moving part, and the cylinder (sometimes called the ‘stator’) or stationary part.

1967 N. E. Borden Jet-engine Fund. 93 The shrouds form a band around the perimeter of the turbine rotor which interlocks the blades at their tips and reduces vibration.

1995 Independent 24 Nov. 22/5 The output of wind turbines is directly determined by the swept area of the rotor.

c. = rotor arm n. at Compounds.

ΘΚΠ

society > occupation and work > equipment > machine > machines which impart power > engine > internal-combustion engine > [noun] > parts of > distributor > parts of

rotor1909

rotor arm1910

1909 Horseless Age 1 Sept. 239/3 The high tension distributor brush is located near the upper end of the rotor.

1959 Motor Man. (ed. 36) viii. 215 Before replacing the rotor..apply a few drops of engine oil to lubricate the cam bearing.

1975 I. Melchior Sleeper Agent iii. 212 Someone's been monkeying with the jeep... The rotor! Someone's pinched the distributor rotor.

2007 Atlanta Mag. Oct. s13/2 (advt.) Cars no longer have points, condensers, and frequently don't have a cap & rotor or even spark plug wires!

d. The rotating container in a centrifuge.

ΘΚΠ

society > occupation and work > equipment > equipment for altering consistency > [noun] > separating apparatus > part of centrifuge

rotor1913

1913 Lancet 20 Sept. 908/1 A centrifuge..is of English make throughout, and the rotor, buckets, and tubes are constructed of duralumin.

1958 M. G. Larian Fund. Chem. Engin. Operations (1959) xiv. 566 The centrifuge is shown in Fig. 24. It consists of a tubular bowl rotor enclosed in a stationary casing.

2007 D. R. Dillon China Challenge iv. 66 The P1 centrifuge machine uses an aluminum rotor to enrich uranium.

3. Aeronautics. A hub with a number of radiating arms that is rotated in an approximately horizontal plane to provide the lift for a helicopter or other rotary-wing aircraft; (also) = tail rotor n. at tail n.¹ Compounds 2.

ΘΚΠ

society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor

ascensional screw1901

lifting screw1902

rotor1915

windmill1931

tilting rotor1940

tilt rotor1961

1915 Proc. Session 1914–5 (Inst. Automobile Engineers) 278 The rotor of a helicopter is not bound down by the ordinary considerations.

1928 Pop. Sci. Monthly Dec. 15/1 A team of men pulling a rope wound round the root of the rotor [of the autogiro], or mast, to give it the first spin required.

1945 Life 26 Feb. 95/1 (caption) Army Platt-LePage R-1 has two counterrotating horizontal rotors, in contrast to Sikorsky's pattern of one main lifting rotor plus stabilizing rotor on the tail.

1985 Orange County Mag. Apr. 166/3 One never approaches the chopper from the rear, for fear of walking into the almost invisible vertical rotor on the tail.

2007 J. R. Chiles God Machine ii. 36 If any lifting rotor fails in flight, a multiple-rotor helicopter will go fatally out of balance.

4. A cylinder mounted vertically on a ship and rotated on its axis, so as to provide a forward propulsive force in a crosswind as a result of the Magnus effect. More fully Flettner rotor [ < the name of Anton Flettner (1885–1961), German engineer, who invented it + rotor n.] .Recorded earliest in rotor ship n. at Compounds.

ΘΚΠ

society > travel > travel by water > vessel, ship, or boat > equipment of vessel > propulsion machinery > [noun] > rotor used to drive ship

rotor1924

1924 Sioux City (Iowa) Jrnl. 7 Nov. 1/5 Germany's biggest sensation since the zeppelin flight, namely Flettner's rotor ship.

1943 R. C. Binder Fluid Mech. xi. 143 The Flettner rotor, which employs the Magnus effect, has been applied to the propulsion of marine vessels.

1982 Winnipeg Free Press 10 Apr. 6/2 The idea of the rotor to propel a ship is not new.

2005 Pop. Sci. Aug. 57/2 Salter wants to outfit each boat with four 60-foot-tall Flettner rotors, which look like smokestacks but act like sails.

5. A disc in an encoding or decoding machine which is rotated in order to change numerous electrical circuits and thereby the code.

ΘΚΠ

the mind > mental capacity > knowledge > secrecy, concealment > code, cipher > [noun] > conversion into code > device > component of

rotor1934

one-time pad1953

indicator1961

1934 U.S. Patent 1,945,014 4/2 The commuting switch or rotor 11 may be rotated by hand, either while the apparatus is not in use of during a pause or stop which may be inserted by previous agreement.

1973 H. Gruppe Truxton Cipher xviii. 189 That moment in '42 when he had handed over the Truxton Cipher rotors to the Russians.

1979 Books & Bookmen Jan. 31/1 The object was to enable the recipient of the message to set the rotors of his own machine for deciphering that particular message.

2006 C. Seife Decoding Universe (2007) i. 17 Most models of Enigma used three rotors.., each of which would click forward twenty-six times before returning to its original orientation.

6. Meteorology. A vortex in which air circulates about a horizontal axis, typically associated with standing waves formed in the lee of a mountain by an airflow passing over it; (also) = rotor cloud n. at Compounds.

ΘΚΠ

the world > matter > gas > air > moving air > [noun] > a movement of air > a current of air > circulating eddy

rotor1944

1944 E. W. Hewson & R. W. Longley Meteorol. xxv. 449 These eddies are known as ‘rotors’ and are sometimes capped by cumuloform clouds.

1955 Tellus 7 367 The stationary lee-waves produced by a big mountain often break up into turbulent whirls or ‘rotors’ in the lower layers of the air flow.

1960 Aeroplane 98 390/3 They moved downwind into the downdraught and at 2,500 ft. dropped into the rotor and its turbulence, which became especially violent from 1,500 ft. down to the ground.

1979 Courier-Mail (Brisbane) 15 June 6/10 Wind conditions against the cliff face caused what was known in the sport as a ‘rotor’. ‘The wind spins across from the hill face and grabs you,’ he said.

2000 C. D. Whiteman Mountain Meteorol. x. 146 Flow over a mountain barrier can be surmised from the presence of certain cloud types, including lenticular clouds, cap clouds, banner clouds, rotors, [etc.].

7. Cell Biology. A ring of protein units in a bacterium which constitutes the moving part of a motor (motor n. 8b) and turns a helical flagellar filament, causing the bacterium to move.

ΚΠ

1975 F. O. Schmidt et al. Functional Linkage in Biomolecular Syst. xiii. 292 A flagellum is driven at its base by a rotary motor, implying the existence of biological equivalents to a rotor, a stator, and rotary bearings.]

1976 Proc. National Acad. Sci. U.S.A. 73 3130/1 There are at least two classes of flagella-related proteins, those that are part of the rotor structure and those that are bound to the cell membrane.

1999 Adv. Microbial Physiol. 41 325 (caption) Ions are deposited on to the rotor by channels that extend to the periplasm..and are removed by separate channels that extend into the cytoplasm.

2005 Jrnl. Bacteriol. 187 5645/2 The motor torque was found to be nearly constant over a wide range of speeds, which is predicted for a mechanism in which energy from the ion gradient is used to apply force to the rotor.

Compounds

rotor arm n. the rotating part of the distributor of an internal combustion engine which successively makes and breaks electrical contacts so that each spark plug fires in turn.

ΘΚΠ

society > occupation and work > equipment > machine > machines which impart power > engine > internal-combustion engine > [noun] > parts of > distributor > parts of

rotor1909

rotor arm1910

1910 J. E. Homans Self-propelled Vehicles xxv. 304 (caption) A high tension current, made up of a series of impulses, is induced in the secondary circuit and distributed by the rotor arm during its revolution to the several cylinders in the proper order of firing.

1968 Listener 25 July 109/1 I stopped the jeep in the middle of the crowd while Kim automatically removed the rotor arm and padlocked the gears.

2007 M. Richards Growing Wild on Exmoor 30 He set about learning more of the engine and found that without the rotor arm, easily removable, the car would not start.

rotor blade n. each of the radiating arms of a rotor of a motor, dynamo, etc., which sweep out a circular area as they rotate; (Aeronautics) each of the arms of the rotor of a helicopter or other rotary-wing aircraft; (Engineering) each of the aerofoils fitted in rows to the rotor of a turbine.

ΘΚΠ

society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor > parts of rotor

rotor head1906

rotor hub1910

rotor blade1915

rotor disc1931

blade1958

1915 Proc. Inst. Automobile Engineers 1914–5 278 Our next consideration will be that of the camber and sectional form of the rotor blade.

1931 J. de la Cierva Wings of Tomorrow viii. 118 This was the only Autogiro that ever broke a rotor blade in flight.

1966 Philos. Trans. (Royal Soc.) A. 260 193 In the final low pressure stages of steam turbines the rotor blades are subjected to erosion by steam-borne water droplets.

2002 Premiere Feb. 48/1 The wash-whop of rotor blades fights it out with machine-gun chatter.

rotor cloud n. Meteorology a turbulent cloud formed within a rotor (sense 6) in the lee of a mountain.

ΘΚΠ

the world > the earth > weather and the atmosphere > weather > cloud > [noun] > a cloud > other specific types of cloud

ice cloud1830

nacreous cloud1909

mother-of-pearl cloud1932

rotor cloud1954

wave cloud1959

1954 Q. Jrnl. Royal Meteorol. Soc. 80 493 At both locations rotor clouds are commonly observed at levels similar to those of the hill tops.

1974 T. Beer Atmospheric Waves iv. 182 The base of the rotor cloud is near the level of the crest while the top may be several thousand feet higher.

2000 C. D. Whiteman Mountain Meteorol. vii. 88 (caption) Higher lee wave clouds are seen above and to the right of the rotor cloud.

rotor disc n. (a) the circular area swept out by rotor blades as they rotate; (b) a disc-shaped rotor head.

ΘΚΠ

society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor > parts of rotor

rotor head1906

rotor hub1910

rotor blade1915

rotor disc1931

blade1958

1931 J. de la Cierva & D. Rose Wings of Tomorrow vii. 101 The rotor blades were of Eiffel 106 airfoil section, and the rotor disc was 32 feet in diameter.

1932 U.S. Patent 1,850,993 1/2 Figure 4 is an enlarged view in elevation of the upper end of the vertically disposed or lifting rotor disk and its associated stator.

1976 B. Jackson Flameout (1977) iv. 54 Klein bent to stare at the forward stages of the compressor rotor. All the wing-like blades were rooted in the rotor disk.

1983 Pop. Sci. Sept. 78/1 Winglike vanes on blade tips turn a turbine's rotor disc into a ducted fan.

2001 M. McKinney in M. McKinney & M. Ryan Chariots of Damned (2003) x. 214 It is standard practice to get permission before coming under the rotor disk of a helicopter.

rotor head n. the central structure from which rotor blades radiate and to which they are attached; esp. one on a helicopter.In quot. 1906: each of numerous protruding teeth fixed to a rotor.

ΘΚΠ

society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor > parts of rotor

rotor head1906

rotor hub1910

rotor blade1915

rotor disc1931

blade1958

1906 U.S. Patent 813,854 1/2 One of the abutments and a registering rotor-head [of a rotary engine].

1931 J. de la Cierva Wings of Tomorrow vi. 93 I propose to overcome the inequality of lift by building into the rotor head a device for changing the angle of incidence of the blades as they made their circle.

1981 Pop. Sci. Jan. 84/1 For really big wind turbines it cuts costs... Rotor-head construction is greatly simplified.

2005 Pilot Oct. 48/1 Its articulated rotor head functions like those on more advanced helicopters.

rotor hub n. = rotor head n.

ΘΚΠ

society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor > parts of rotor

rotor head1906

rotor hub1910

rotor blade1915

rotor disc1931

blade1958

1910 U.S. Patent 968,934 1/2 A detached perspective view of the centrifugal-dogs with a detached fragmentary sectional view of the adjacent end of the rotor hub.

1949 Electronic Engin. 21 292/2 The testing tower..was erected to provide a means of testing rotor hubs and blades independently of helicopter aircraft.

2004 J. Watkinson Art Helicopter ii. 37 In helicopters the phase angle is taken to be the angle between the blade and a line drawn directly aft from the rotor hub.

rotor ship n. a ship which uses rotors (sense 4) as a means of propulsion.

ΘΚΠ

society > travel > travel by water > vessel, ship, or boat > mechanically propelled vessels > [noun] > propelled by rotors

rotor ship1924

1924Rotor ship [see sense 4].

1949 O. G. Sutton Sci. of Flight iv. 84 The idea of a rotor-ship does not seem to have appealed to ship-builders in general and it is now regarded as a scientific curiosity and no more.

2004 I. H. Shames Mech. Fluids 616 The famous Flettner rotor ship that crossed the ocean propelled by two rotating cylinders exposed to a transverse wind.

rotor wash n. turbulence or flow of air, esp. a downdraught, caused by a helicopter rotor.In quot. 1944 figurative; cf. hot air n. 2.

ΚΠ

1944 H. F. Gregory Anything Horse can Do xvii. 177 These things were still untried. And unless they could be accomplished, the whole idea was just so much rotor-wash.

1947 C. S. Jackson & J. Stein Newsroom Dragonfly A long branch of a tree caught the rotor wash, reeled away and then swept back, smashing the copter's tail rotor.

1992 Equinox Aug. 50/2 The rotor wash, flowing down along the vertical cliff face, had caught him in a tornadolike vortex.

2005 J. Fredston Snowstruck iv. 122 As the helicopter moved into a hover overhead, the freezing rotor wash would reach a hundred miles per hour.

This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022).

单词	rotor
释义	rotorn. Brit. /ˈrəʊtə/, U.S. /ˈroʊdər/ Origin: Formed within English, by clipping or shortening. Etymon: rotator n. Etymology: Shortened < rotator n.In sense 6 after German Rotor (J. Küttner 1938, in Beiträge zur Physik der freien Atmosphäre 25 108). 1. Mathematics. In the terminology of W. K. Clifford: a quantity having magnitude, direction, and position, the simplest of which is a rotational velocity about an axis. Cf. motor n. 6. Now historical and rare. ΘΚΠ the world > relative properties > number > mathematical number or quantity > tensor > [noun] > rotor rotor1873 rotator1879 1873 W. K. Clifford in London Math. Soc. Proc. 4 381 I propose to use the name rotor (short for rotator) to mean a quantity having magnitude, direction, and position, of which the simplest type is a velocity of rotation about a certain axis. 1882 Nature 6 July 218/2 Such a displacement is the same as a rotation about the polar of the given line, and is hence called by Clifford a Rotor. 1904 A. Jamieson Elem. Man. Appl. Mech. (ed. 6) i. 5b A localised vector is called a Rotor (Clifford). 2000 M. Shoham in M. Ceccarelli Proc. Internat. Symp. Hist. Machines & Mechanisms v. 177 In his work, Clifford distinguished between vectors..and rotors, which are entities having a magnitude, direction and position. 2. a. Electrical Engineering. The rotating part of a motor, dynamo, etc. Cf. stator n.² 1. ΘΚΠ society > occupation and work > equipment > machine > machines which impart power > motor > [noun] > other parts of gear1814 controller1836 phonic wheel1878 reverser1879 rotor1892 stator1892 brush-holder1894 interpole1907 phonic motor1924 the world > matter > physics > electromagnetic radiation > electricity > electrical engineering > generator > [noun] > rotating part rotor1892 1892 Electr. World 1 Oct. 209/3 There are two laminated so-called field magnets, or ‘stators’, as we may call them, each embracing a so-called armature or ‘rotor’. 1922 Pop. Sci. Monthly July 64/1 Rolling a 65-ton dynamo rotor ten miles over the road to a power house proved to be easier than delivering it on a special truck. 1969 E. P. Anderson Home Appliance Servicing (ed. 2) xvi. 255 In the induction motor, the mechanical force produced between the rotor and the stator by the current is transformed into mechanical power. 1987 E. H. J. Pallett Aircraft Electr. Syst. (ed. 3) i. 7/2 The generator or alternator as it is more generally called, consists of a rotor, stator, slip ring and brush assembly and end frames. 2010 N.Y. Times (Nexis) 7 Feb. (Automobiles section) 8 More powerful motors can be built by making the magnets of rare-earth metals like neodymium, which increases the rotor's magnetic flux. b. Engineering. The rotating assembly in a turbine; = runner n.¹ 15. Cf. stator n.² 2. ΘΚΠ society > occupation and work > equipment > machine > machines which impart power > turbine > [noun] > parts of > other parts runner1878 penstock1894 rotor1903 turbofan1911 spill burner1945 1903 U.S. Patent 729,215 1/1 Steam at this high velocity impinges on buckets or vanes formed to receive the impact and by deflection of flow secures reactive force upon the rotor. 1916 J. W. M. Sothern Marine Steam Turbine (ed. 4) viii. 424 The turbine consists of two principal parts, the rotor or moving part, and the cylinder (sometimes called the ‘stator’) or stationary part. 1967 N. E. Borden Jet-engine Fund. 93 The shrouds form a band around the perimeter of the turbine rotor which interlocks the blades at their tips and reduces vibration. 1995 Independent 24 Nov. 22/5 The output of wind turbines is directly determined by the swept area of the rotor. c. = rotor arm n. at Compounds. ΘΚΠ society > occupation and work > equipment > machine > machines which impart power > engine > internal-combustion engine > [noun] > parts of > distributor > parts of rotor1909 rotor arm1910 1909 Horseless Age 1 Sept. 239/3 The high tension distributor brush is located near the upper end of the rotor. 1959 Motor Man. (ed. 36) viii. 215 Before replacing the rotor..apply a few drops of engine oil to lubricate the cam bearing. 1975 I. Melchior Sleeper Agent iii. 212 Someone's been monkeying with the jeep... The rotor! Someone's pinched the distributor rotor. 2007 Atlanta Mag. Oct. s13/2 (advt.) Cars no longer have points, condensers, and frequently don't have a cap & rotor or even spark plug wires! d. The rotating container in a centrifuge. ΘΚΠ society > occupation and work > equipment > equipment for altering consistency > [noun] > separating apparatus > part of centrifuge rotor1913 1913 Lancet 20 Sept. 908/1 A centrifuge..is of English make throughout, and the rotor, buckets, and tubes are constructed of duralumin. 1958 M. G. Larian Fund. Chem. Engin. Operations (1959) xiv. 566 The centrifuge is shown in Fig. 24. It consists of a tubular bowl rotor enclosed in a stationary casing. 2007 D. R. Dillon China Challenge iv. 66 The P1 centrifuge machine uses an aluminum rotor to enrich uranium. 3. Aeronautics. A hub with a number of radiating arms that is rotated in an approximately horizontal plane to provide the lift for a helicopter or other rotary-wing aircraft; (also) = tail rotor n. at tail n.¹ Compounds 2. ΘΚΠ society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor ascensional screw1901 lifting screw1902 rotor1915 windmill1931 tilting rotor1940 tilt rotor1961 1915 Proc. Session 1914–5 (Inst. Automobile Engineers) 278 The rotor of a helicopter is not bound down by the ordinary considerations. 1928 Pop. Sci. Monthly Dec. 15/1 A team of men pulling a rope wound round the root of the rotor [of the autogiro], or mast, to give it the first spin required. 1945 Life 26 Feb. 95/1 (caption) Army Platt-LePage R-1 has two counterrotating horizontal rotors, in contrast to Sikorsky's pattern of one main lifting rotor plus stabilizing rotor on the tail. 1985 Orange County Mag. Apr. 166/3 One never approaches the chopper from the rear, for fear of walking into the almost invisible vertical rotor on the tail. 2007 J. R. Chiles God Machine ii. 36 If any lifting rotor fails in flight, a multiple-rotor helicopter will go fatally out of balance. 4. A cylinder mounted vertically on a ship and rotated on its axis, so as to provide a forward propulsive force in a crosswind as a result of the Magnus effect. More fully Flettner rotor [ < the name of Anton Flettner (1885–1961), German engineer, who invented it + rotor n.] .Recorded earliest in rotor ship n. at Compounds. ΘΚΠ society > travel > travel by water > vessel, ship, or boat > equipment of vessel > propulsion machinery > [noun] > rotor used to drive ship rotor1924 1924 Sioux City (Iowa) Jrnl. 7 Nov. 1/5 Germany's biggest sensation since the zeppelin flight, namely Flettner's rotor ship. 1943 R. C. Binder Fluid Mech. xi. 143 The Flettner rotor, which employs the Magnus effect, has been applied to the propulsion of marine vessels. 1982 Winnipeg Free Press 10 Apr. 6/2 The idea of the rotor to propel a ship is not new. 2005 Pop. Sci. Aug. 57/2 Salter wants to outfit each boat with four 60-foot-tall Flettner rotors, which look like smokestacks but act like sails. 5. A disc in an encoding or decoding machine which is rotated in order to change numerous electrical circuits and thereby the code. ΘΚΠ the mind > mental capacity > knowledge > secrecy, concealment > code, cipher > [noun] > conversion into code > device > component of rotor1934 one-time pad1953 indicator1961 1934 U.S. Patent 1,945,014 4/2 The commuting switch or rotor 11 may be rotated by hand, either while the apparatus is not in use of during a pause or stop which may be inserted by previous agreement. 1973 H. Gruppe Truxton Cipher xviii. 189 That moment in '42 when he had handed over the Truxton Cipher rotors to the Russians. 1979 Books & Bookmen Jan. 31/1 The object was to enable the recipient of the message to set the rotors of his own machine for deciphering that particular message. 2006 C. Seife Decoding Universe (2007) i. 17 Most models of Enigma used three rotors.., each of which would click forward twenty-six times before returning to its original orientation. 6. Meteorology. A vortex in which air circulates about a horizontal axis, typically associated with standing waves formed in the lee of a mountain by an airflow passing over it; (also) = rotor cloud n. at Compounds. ΘΚΠ the world > matter > gas > air > moving air > [noun] > a movement of air > a current of air > circulating eddy rotor1944 1944 E. W. Hewson & R. W. Longley Meteorol. xxv. 449 These eddies are known as ‘rotors’ and are sometimes capped by cumuloform clouds. 1955 Tellus 7 367 The stationary lee-waves produced by a big mountain often break up into turbulent whirls or ‘rotors’ in the lower layers of the air flow. 1960 Aeroplane 98 390/3 They moved downwind into the downdraught and at 2,500 ft. dropped into the rotor and its turbulence, which became especially violent from 1,500 ft. down to the ground. 1979 Courier-Mail (Brisbane) 15 June 6/10 Wind conditions against the cliff face caused what was known in the sport as a ‘rotor’. ‘The wind spins across from the hill face and grabs you,’ he said. 2000 C. D. Whiteman Mountain Meteorol. x. 146 Flow over a mountain barrier can be surmised from the presence of certain cloud types, including lenticular clouds, cap clouds, banner clouds, rotors, [etc.]. 7. Cell Biology. A ring of protein units in a bacterium which constitutes the moving part of a motor (motor n. 8b) and turns a helical flagellar filament, causing the bacterium to move. ΚΠ 1975 F. O. Schmidt et al. Functional Linkage in Biomolecular Syst. xiii. 292 A flagellum is driven at its base by a rotary motor, implying the existence of biological equivalents to a rotor, a stator, and rotary bearings.] 1976 Proc. National Acad. Sci. U.S.A. 73 3130/1 There are at least two classes of flagella-related proteins, those that are part of the rotor structure and those that are bound to the cell membrane. 1999 Adv. Microbial Physiol. 41 325 (caption) Ions are deposited on to the rotor by channels that extend to the periplasm..and are removed by separate channels that extend into the cytoplasm. 2005 Jrnl. Bacteriol. 187 5645/2 The motor torque was found to be nearly constant over a wide range of speeds, which is predicted for a mechanism in which energy from the ion gradient is used to apply force to the rotor. Compounds rotor arm n. the rotating part of the distributor of an internal combustion engine which successively makes and breaks electrical contacts so that each spark plug fires in turn. ΘΚΠ society > occupation and work > equipment > machine > machines which impart power > engine > internal-combustion engine > [noun] > parts of > distributor > parts of rotor1909 rotor arm1910 1910 J. E. Homans Self-propelled Vehicles xxv. 304 (caption) A high tension current, made up of a series of impulses, is induced in the secondary circuit and distributed by the rotor arm during its revolution to the several cylinders in the proper order of firing. 1968 Listener 25 July 109/1 I stopped the jeep in the middle of the crowd while Kim automatically removed the rotor arm and padlocked the gears. 2007 M. Richards Growing Wild on Exmoor 30 He set about learning more of the engine and found that without the rotor arm, easily removable, the car would not start. rotor blade n. each of the radiating arms of a rotor of a motor, dynamo, etc., which sweep out a circular area as they rotate; (Aeronautics) each of the arms of the rotor of a helicopter or other rotary-wing aircraft; (Engineering) each of the aerofoils fitted in rows to the rotor of a turbine. ΘΚΠ society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor > parts of rotor rotor head1906 rotor hub1910 rotor blade1915 rotor disc1931 blade1958 1915 Proc. Inst. Automobile Engineers 1914–5 278 Our next consideration will be that of the camber and sectional form of the rotor blade. 1931 J. de la Cierva Wings of Tomorrow viii. 118 This was the only Autogiro that ever broke a rotor blade in flight. 1966 Philos. Trans. (Royal Soc.) A. 260 193 In the final low pressure stages of steam turbines the rotor blades are subjected to erosion by steam-borne water droplets. 2002 Premiere Feb. 48/1 The wash-whop of rotor blades fights it out with machine-gun chatter. rotor cloud n. Meteorology a turbulent cloud formed within a rotor (sense 6) in the lee of a mountain. ΘΚΠ the world > the earth > weather and the atmosphere > weather > cloud > [noun] > a cloud > other specific types of cloud ice cloud1830 nacreous cloud1909 mother-of-pearl cloud1932 rotor cloud1954 wave cloud1959 1954 Q. Jrnl. Royal Meteorol. Soc. 80 493 At both locations rotor clouds are commonly observed at levels similar to those of the hill tops. 1974 T. Beer Atmospheric Waves iv. 182 The base of the rotor cloud is near the level of the crest while the top may be several thousand feet higher. 2000 C. D. Whiteman Mountain Meteorol. vii. 88 (caption) Higher lee wave clouds are seen above and to the right of the rotor cloud. rotor disc n. (a) the circular area swept out by rotor blades as they rotate; (b) a disc-shaped rotor head. ΘΚΠ society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor > parts of rotor rotor head1906 rotor hub1910 rotor blade1915 rotor disc1931 blade1958 1931 J. de la Cierva & D. Rose Wings of Tomorrow vii. 101 The rotor blades were of Eiffel 106 airfoil section, and the rotor disc was 32 feet in diameter. 1932 U.S. Patent 1,850,993 1/2 Figure 4 is an enlarged view in elevation of the upper end of the vertically disposed or lifting rotor disk and its associated stator. 1976 B. Jackson Flameout (1977) iv. 54 Klein bent to stare at the forward stages of the compressor rotor. All the wing-like blades were rooted in the rotor disk. 1983 Pop. Sci. Sept. 78/1 Winglike vanes on blade tips turn a turbine's rotor disc into a ducted fan. 2001 M. McKinney in M. McKinney & M. Ryan Chariots of Damned (2003) x. 214 It is standard practice to get permission before coming under the rotor disk of a helicopter. rotor head n. the central structure from which rotor blades radiate and to which they are attached; esp. one on a helicopter.In quot. 1906: each of numerous protruding teeth fixed to a rotor. ΘΚΠ society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor > parts of rotor rotor head1906 rotor hub1910 rotor blade1915 rotor disc1931 blade1958 1906 U.S. Patent 813,854 1/2 One of the abutments and a registering rotor-head [of a rotary engine]. 1931 J. de la Cierva Wings of Tomorrow vi. 93 I propose to overcome the inequality of lift by building into the rotor head a device for changing the angle of incidence of the blades as they made their circle. 1981 Pop. Sci. Jan. 84/1 For really big wind turbines it cuts costs... Rotor-head construction is greatly simplified. 2005 Pilot Oct. 48/1 Its articulated rotor head functions like those on more advanced helicopters. rotor hub n. = rotor head n. ΘΚΠ society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor > parts of rotor rotor head1906 rotor hub1910 rotor blade1915 rotor disc1931 blade1958 1910 U.S. Patent 968,934 1/2 A detached perspective view of the centrifugal-dogs with a detached fragmentary sectional view of the adjacent end of the rotor hub. 1949 Electronic Engin. 21 292/2 The testing tower..was erected to provide a means of testing rotor hubs and blades independently of helicopter aircraft. 2004 J. Watkinson Art Helicopter ii. 37 In helicopters the phase angle is taken to be the angle between the blade and a line drawn directly aft from the rotor hub. rotor ship n. a ship which uses rotors (sense 4) as a means of propulsion. ΘΚΠ society > travel > travel by water > vessel, ship, or boat > mechanically propelled vessels > [noun] > propelled by rotors rotor ship1924 1924Rotor ship [see sense 4]. 1949 O. G. Sutton Sci. of Flight iv. 84 The idea of a rotor-ship does not seem to have appealed to ship-builders in general and it is now regarded as a scientific curiosity and no more. 2004 I. H. Shames Mech. Fluids 616 The famous Flettner rotor ship that crossed the ocean propelled by two rotating cylinders exposed to a transverse wind. rotor wash n. turbulence or flow of air, esp. a downdraught, caused by a helicopter rotor.In quot. 1944 figurative; cf. hot air n. 2. ΚΠ 1944 H. F. Gregory Anything Horse can Do xvii. 177 These things were still untried. And unless they could be accomplished, the whole idea was just so much rotor-wash. 1947 C. S. Jackson & J. Stein Newsroom Dragonfly A long branch of a tree caught the rotor wash, reeled away and then swept back, smashing the copter's tail rotor. 1992 Equinox Aug. 50/2 The rotor wash, flowing down along the vertical cliff face, had caught him in a tornadolike vortex. 2005 J. Fredston Snowstruck iv. 122 As the helicopter moved into a hover overhead, the freezing rotor wash would reach a hundred miles per hour. This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022). < n.1873
随便看	authoritarians authoritative authoritatively authoritativeness authoritativenesses authorities authority authority figure authority-hating authority-loving authority-maker authorityhating authorityloving authoritymaker authorizable authorization authorization bill authorization code authorization form authorizations authorize authorized authorized capital authorized firearms officer authorized version