preselectorn.

Brit.

/priːsᵻˈlɛktə/, U.S.

/prisəˈlɛktər/

Origin: Formed within English, by derivation. Etymons: pre- prefix, selector n.

Etymology: < pre- prefix + selector n., after preselect v.

1. Telephony. A switch in a telephone exchange which, when a receiver is lifted, automatically connects the calling line to a free trunk by a hunting action, independently of impulses produced by dialling. Formerly also: = line finder n. at line n.² Compounds 2.

ΘΚΠ

society > communication > telecommunication > telegraphy or telephony > telephony > telephone equipment > [noun] > exchange > exchange equipment

private line1852

bank1884

call-disc1884

howler1886

trunk1889

multiple switchboard1891

rack1893

line switch1898

heat coil1900

relay rack1902

multiple1905

listening key1906

telharmonium1906

wiper1906

preselector1912

line finder1922

rank1924

routiner1928

keysender1929

uniselector1930

wiper arm1933

1912 J. Poole Pract. Telephone Handbk. (ed. 5) xxxii. 535 The line-switch used by Siemens is a specially neat arrangement... It is called a ‘pre-selector’ by Messrs Siemens, and each switch is complete in itself.

1924 H. H. Harrison Introd. Strowger Syst. Autom. Telephony i. 26 The preselector or line switch..hunts to find one of ten or more idle group selectors.

1976 T. H. Flowers Introd. Exchange Syst. iv. 89 Whereas line finders must be full-sized exchange switches to achieve satisfactory traffic loading, pre-selector switches may have as few as ten contacts in the banks.

1982 R. J. Chapuis 100 Years Telephone Switching I. 67/1 In Germany..preselection was introduced in 1909, with a different kind of preselector.

2. Telecommunications. A tuned circuit preceding the first mixer in a superheterodyne receiver; an analogous filter in a microwave receiver.

ΘΚΠ

society > communication > telecommunication > radio communications > radio equipment > [noun] > radio set > circuits

autoheterodyne1916

autodyne1919

oscillator circuit1920

preselector1927

1927 Syracuse (N.Y.) Herald 4 Sept. iii. 2/5 Several have written and phoned telling of their success with The Herald power amplifier..and the pre-selector described two weeks ago.

1951 A. Sheingold Fund. Radio Communications xv. 307 The preselector, when present, helps to maintain a favorable signal-to-noise ratio.

1975 D. G. Fink Electronics Engineers' Handbk. xxv. 72 Preselectors can provide up to 80 dB suppression of signals from other radar transmitters in the same rf band but at a different operating frequency.

2004 Microwave Jrnl. (Nexis) 1 Oct. 138 When the need for multi-band operation is added, the only solution for front end filtering is to use electronically tunable pre-selectors.

3. A gearbox that enables a driver to select the next gear at any time before the change is actually made. Usually attributive.

ΘΚΠ

society > occupation and work > equipment > machine > parts of machines > wheel > [adjective] > types of cogs or gears > types of gearbox

self-changing1928

preselector1930

society > occupation and work > equipment > machine > parts of machines > wheel > [noun] > cog or gear > which allows change of speed or direction > parts of

reversing lever1822

reverse lever1839

change-speed1881

reverse1882

Johnson bar1884

gate1906

synchromesh1929

hot shift1971

preselector1979

1930 Engineering 17 Oct. 498/2 There is one cam for each gear, all mounted on a common shaft coupled to the pre-selector lever.

1969 Driving (Min. of Transport) xvi. 198 ‘Pre-selector’ transmissions, mostly found on buses and coaches, have a lever by which the driver can select gears in advance, ready for later changes... No gear change takes place until a gear-change pedal is pressed and released.

1979 J. Leasor Love & Land Beyond i. 13 An electrical gear change which could be used as an ordinary box or as a preselector.

1988 R. Pickernell Yanto's Summer (BNC) 46 Barney explained the intricacies of the pre-selector gearbox, after which Julie engaged first gear and, with a slight jolt, moved the big car slowly down the station drive.

1990 W. A. Livesey GCSE Motor Vehicle Stud. ix. 79/1 In certain specialised gearboxes such as preselector and various types of automatic gearboxes, epicyclic gears are used.

This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022).

单词	preselector
释义	preselectorn. Brit. /priːsᵻˈlɛktə/, U.S. /prisəˈlɛktər/ Origin: Formed within English, by derivation. Etymons: pre- prefix, selector n. Etymology: < pre- prefix + selector n., after preselect v. 1. Telephony. A switch in a telephone exchange which, when a receiver is lifted, automatically connects the calling line to a free trunk by a hunting action, independently of impulses produced by dialling. Formerly also: = line finder n. at line n.² Compounds 2. ΘΚΠ society > communication > telecommunication > telegraphy or telephony > telephony > telephone equipment > [noun] > exchange > exchange equipment private line1852 bank1884 call-disc1884 howler1886 trunk1889 multiple switchboard1891 rack1893 line switch1898 heat coil1900 relay rack1902 multiple1905 listening key1906 telharmonium1906 wiper1906 preselector1912 line finder1922 rank1924 routiner1928 keysender1929 uniselector1930 wiper arm1933 1912 J. Poole Pract. Telephone Handbk. (ed. 5) xxxii. 535 The line-switch used by Siemens is a specially neat arrangement... It is called a ‘pre-selector’ by Messrs Siemens, and each switch is complete in itself. 1924 H. H. Harrison Introd. Strowger Syst. Autom. Telephony i. 26 The preselector or line switch..hunts to find one of ten or more idle group selectors. 1976 T. H. Flowers Introd. Exchange Syst. iv. 89 Whereas line finders must be full-sized exchange switches to achieve satisfactory traffic loading, pre-selector switches may have as few as ten contacts in the banks. 1982 R. J. Chapuis 100 Years Telephone Switching I. 67/1 In Germany..preselection was introduced in 1909, with a different kind of preselector. 2. Telecommunications. A tuned circuit preceding the first mixer in a superheterodyne receiver; an analogous filter in a microwave receiver. ΘΚΠ society > communication > telecommunication > radio communications > radio equipment > [noun] > radio set > circuits autoheterodyne1916 autodyne1919 oscillator circuit1920 preselector1927 1927 Syracuse (N.Y.) Herald 4 Sept. iii. 2/5 Several have written and phoned telling of their success with The Herald power amplifier..and the pre-selector described two weeks ago. 1951 A. Sheingold Fund. Radio Communications xv. 307 The preselector, when present, helps to maintain a favorable signal-to-noise ratio. 1975 D. G. Fink Electronics Engineers' Handbk. xxv. 72 Preselectors can provide up to 80 dB suppression of signals from other radar transmitters in the same rf band but at a different operating frequency. 2004 Microwave Jrnl. (Nexis) 1 Oct. 138 When the need for multi-band operation is added, the only solution for front end filtering is to use electronically tunable pre-selectors. 3. A gearbox that enables a driver to select the next gear at any time before the change is actually made. Usually attributive. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > wheel > [adjective] > types of cogs or gears > types of gearbox self-changing1928 preselector1930 society > occupation and work > equipment > machine > parts of machines > wheel > [noun] > cog or gear > which allows change of speed or direction > parts of reversing lever1822 reverse lever1839 change-speed1881 reverse1882 Johnson bar1884 gate1906 synchromesh1929 hot shift1971 preselector1979 1930 Engineering 17 Oct. 498/2 There is one cam for each gear, all mounted on a common shaft coupled to the pre-selector lever. 1969 Driving (Min. of Transport) xvi. 198 ‘Pre-selector’ transmissions, mostly found on buses and coaches, have a lever by which the driver can select gears in advance, ready for later changes... No gear change takes place until a gear-change pedal is pressed and released. 1979 J. Leasor Love & Land Beyond i. 13 An electrical gear change which could be used as an ordinary box or as a preselector. 1988 R. Pickernell Yanto's Summer (BNC) 46 Barney explained the intricacies of the pre-selector gearbox, after which Julie engaged first gear and, with a slight jolt, moved the big car slowly down the station drive. 1990 W. A. Livesey GCSE Motor Vehicle Stud. ix. 79/1 In certain specialised gearboxes such as preselector and various types of automatic gearboxes, epicyclic gears are used. This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022). < n.1912
随便看	θ232903 θ232904 θ232905 θ232906 θ232907 θ232908 θ232909 θ23291 θ232910 θ232911 θ232912 θ232913 θ232914 θ232915 θ232916 θ232917 θ232918 θ232919 θ23292 θ232920 θ232921 θ232922 θ232923 θ232924 θ232925