Nasmythn.

Brit.

/ˈneɪsmɪθ/, U.S.

/ˈneɪˌsmɪθ/

Origin: From a proper name. Etymon: proper name Nasmyth.

Etymology: < the name of James Nasmyth (1808–90), Scottish engineer, who invented the steam hammer in 1839, and the telescope system c1842.

1. attributive and in the genitive. Designating a type of steam hammer or piledriver in which the falling weight is raised by steam pressure on a piston to which the weight is attached.

ΘΚΠ

society > occupation and work > equipment > driving or beating tools > [noun] > hammer > mechanical and power hammers > types of

tilt-hammer1773

trip-hammer1781

tilt1831

Nasmyth1845

oliver1846

helve-hammer1858

striker1869

belly-helve1881

chipping hammer1988

1845 Jrnl. Franklin Inst. 40 283 Nasmyth's steam hammer for pile driving.

a1877 E. H. Knight Pract. Dict. Mech. III. 2348/2 Plate LXII shows the new Nasmyth steam-hammer at Woolwich, England. It is at present the largest and most powerful in the world.

1892 Youth's Compan. 16 June 315/1 An engineer should know how to build a bridge, divert a river, make..a Nasmyth's hammer.

1902 L. F. Vernon-Harcourt Civil Engin. iv. 56 Nasmyth's pile-driver is the oldest and best-known form of these machines.

1928 R. Bridges in H. Bradley Coll. Papers 43 A friend whose mind I used to compare to a Nasmyth's hammer, which can weld a ton of iron or crack a nut without crushing its kernel.

1945 R. Hargreaves Enemy at Gate 278 Bringing, in effect, a Nasmyth hammer to the task of cracking a walnut.

1963 A. F. Burstall Hist. Mech. Engin. vi. 207 Considerable improvements took place in forging, particularly after the invention of Nasmyth's steam hammer..in 1839.

1992 Devon Hist. Apr. 14 (title) Nasmyth's steam hammer at Devonport.

2. Astronomy. attributive. Designating or relating to a Nasmyth–Cassegrain. Nasmyth flat n. the tertiary plane mirror used to deflect through 90 degrees the light from the secondary mirror. Nasmyth focus n. an external focal point to one side of the tube of a reflecting telescope at its lower end.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > reflecting telescopes

reflecting telescope1672

reflector1735

speculum1789

Herschelian telescope1792

Newtonian1820

reflector telescope1840

Cassegrain1888

Nasmyth1960

Nasmyth–Cassegrain1972

1874 Philos. Trans. 1873 (Royal Soc.) 163 220 The Rillen of Mädler, which to the writer's eye, with Mr. Nasmyth's best telescope,..appear as cracks or deep sharp-edged fissures.]

1960 Q. Jrnl. Royal Astron. Soc. 1 200 The telescope can also be used at the Nasmyth focus in the range of declination from the North Pole to 30°S for stellar work.

1984 Optical Engin. 23 805/1 The astigmatism arising from slight curvature of the Nasmyth folding flat will be small.

1984 Optical Engin. 23 805/1 In the case of a Nasmyth telescope there is another possible cause of astigmatism in the image field.

1985 Proc. SPIE (Internat. Soc. Optical Engin.) 542 42 The Nasmyth flat and corrector housing are supported by a rigid elevation box structure.

1990 Proc. SPIE (Internat. Soc. Optical Engin.) 1236 129 A wide-field focus is required.., but should not conflict with the need to switch between Cassegrain and Nasmyth positions.

1993 Science 24 Sept. 1713/2 The 1991 measurements were made..with the UKT14 bolometer at the Nasmyth focus of the 15-m James Clerk Maxwell telescope.

This entry has been updated (OED Third Edition, June 2003; most recently modified version published online March 2022).

单词	nasmyth
释义	Nasmythn. Brit. /ˈneɪsmɪθ/, U.S. /ˈneɪˌsmɪθ/ Origin: From a proper name. Etymon: proper name Nasmyth. Etymology: < the name of James Nasmyth (1808–90), Scottish engineer, who invented the steam hammer in 1839, and the telescope system c1842. 1. attributive and in the genitive. Designating a type of steam hammer or piledriver in which the falling weight is raised by steam pressure on a piston to which the weight is attached. ΘΚΠ society > occupation and work > equipment > driving or beating tools > [noun] > hammer > mechanical and power hammers > types of tilt-hammer1773 trip-hammer1781 tilt1831 Nasmyth1845 oliver1846 helve-hammer1858 striker1869 belly-helve1881 chipping hammer1988 1845 Jrnl. Franklin Inst. 40 283 Nasmyth's steam hammer for pile driving. a1877 E. H. Knight Pract. Dict. Mech. III. 2348/2 Plate LXII shows the new Nasmyth steam-hammer at Woolwich, England. It is at present the largest and most powerful in the world. 1892 Youth's Compan. 16 June 315/1 An engineer should know how to build a bridge, divert a river, make..a Nasmyth's hammer. 1902 L. F. Vernon-Harcourt Civil Engin. iv. 56 Nasmyth's pile-driver is the oldest and best-known form of these machines. 1928 R. Bridges in H. Bradley Coll. Papers 43 A friend whose mind I used to compare to a Nasmyth's hammer, which can weld a ton of iron or crack a nut without crushing its kernel. 1945 R. Hargreaves Enemy at Gate 278 Bringing, in effect, a Nasmyth hammer to the task of cracking a walnut. 1963 A. F. Burstall Hist. Mech. Engin. vi. 207 Considerable improvements took place in forging, particularly after the invention of Nasmyth's steam hammer..in 1839. 1992 Devon Hist. Apr. 14 (title) Nasmyth's steam hammer at Devonport. 2. Astronomy. attributive. Designating or relating to a Nasmyth–Cassegrain. Nasmyth flat n. the tertiary plane mirror used to deflect through 90 degrees the light from the secondary mirror. Nasmyth focus n. an external focal point to one side of the tube of a reflecting telescope at its lower end. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > reflecting telescopes reflecting telescope1672 reflector1735 speculum1789 Herschelian telescope1792 Newtonian1820 reflector telescope1840 Cassegrain1888 Nasmyth1960 Nasmyth–Cassegrain1972 1874 Philos. Trans. 1873 (Royal Soc.) 163 220 The Rillen of Mädler, which to the writer's eye, with Mr. Nasmyth's best telescope,..appear as cracks or deep sharp-edged fissures.] 1960 Q. Jrnl. Royal Astron. Soc. 1 200 The telescope can also be used at the Nasmyth focus in the range of declination from the North Pole to 30°S for stellar work. 1984 Optical Engin. 23 805/1 The astigmatism arising from slight curvature of the Nasmyth folding flat will be small. 1984 Optical Engin. 23 805/1 In the case of a Nasmyth telescope there is another possible cause of astigmatism in the image field. 1985 Proc. SPIE (Internat. Soc. Optical Engin.) 542 42 The Nasmyth flat and corrector housing are supported by a rigid elevation box structure. 1990 Proc. SPIE (Internat. Soc. Optical Engin.) 1236 129 A wide-field focus is required.., but should not conflict with the need to switch between Cassegrain and Nasmyth positions. 1993 Science 24 Sept. 1713/2 The 1991 measurements were made..with the UKT14 bolometer at the Nasmyth focus of the 15-m James Clerk Maxwell telescope. This entry has been updated (OED Third Edition, June 2003; most recently modified version published online March 2022). < n.1845
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