Kellnern.

Brit.

/ˈkɛlnə/, U.S.

/ˈkɛlnər/

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

Etymology: < the name of Karl Kellner (1826–55), German optical instrument maker, who introduced the eyepiece in 1849.

I. Compounds.

1. attributive. Designating a compound eyepiece used esp. for telescopes, consisting of a planoconvex field lens and an eye lens that is an achromatic doublet.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > lens > [adjective] > eye-piece

pancratic1831

stenopaeic1864

Kellner1865

1865 Proc. Royal Soc. 14 46 In tracing the path of a ‘spot’ across the disk of the sun, I employ a Kellner (positive) eyepiece of about 50 linear.

1922 E. Rutherford in London, Edinb., & Dublin Philos. Mag. 6th Ser. 44 418 A modified form of Kellner eyepiece was constructed.

1969 Jrnl. Brit. Astron. Assoc. 79 354 The proper description of this type is achromatic Ramsden, but it is often referred to as Kellner type. The eyepiece properly described as of Kellner type is that shown in figure 6, which has a double convex field lens with a cemented doublet eye lens having a concave surface facing the eye.

1998 Mod. Astronomer Mar. 54/1 Accessories include a star diagonal and Kellner eyepieces of 25 millimetres (×35.4) and 10 millimetres (×91) focal length.

II. Simple uses.

2. A Kellner eyepiece.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > lens > [noun] > eye-piece

eyeglass1665

ocular1702

eyepiece1729

Ramsden1787

field glass1797

negative eyepiece1831

positive eyepiece1842

Kellner1865

orthoscopic1868

eye-point1875

comparison eyepiece1940

1865 Proc. Royal Soc. 14 46 Having..determined the positions of the spots, I replace the Kellner by ordinary (negative) eyepieces.

1922 L. Bell Telescope vi. 145 The Kellner is decidedly valuable as a wide field positive ocular.

1969 Jrnl. Brit. Astron. Assoc. 79 p. ii/2 (advt.) We have designed and manufactured a first-class ortho of ⅓″ focus and 45° field... Barlows, Ramsdens, Kellners stocked.

1995 Sky & Telescope May 8/3 The effect is most pronounced in the least complex eyepieces, such as Kellners and Plössls.

This is a new entry (OED Third Edition, September 2002; most recently modified version published online March 2022).

单词	kellner
释义	Kellnern. Brit. /ˈkɛlnə/, U.S. /ˈkɛlnər/ Origin: From a proper name. Etymon: proper name Kellner. Etymology: < the name of Karl Kellner (1826–55), German optical instrument maker, who introduced the eyepiece in 1849. I. Compounds. 1. attributive. Designating a compound eyepiece used esp. for telescopes, consisting of a planoconvex field lens and an eye lens that is an achromatic doublet. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > lens > [adjective] > eye-piece pancratic1831 stenopaeic1864 Kellner1865 1865 Proc. Royal Soc. 14 46 In tracing the path of a ‘spot’ across the disk of the sun, I employ a Kellner (positive) eyepiece of about 50 linear. 1922 E. Rutherford in London, Edinb., & Dublin Philos. Mag. 6th Ser. 44 418 A modified form of Kellner eyepiece was constructed. 1969 Jrnl. Brit. Astron. Assoc. 79 354 The proper description of this type is achromatic Ramsden, but it is often referred to as Kellner type. The eyepiece properly described as of Kellner type is that shown in figure 6, which has a double convex field lens with a cemented doublet eye lens having a concave surface facing the eye. 1998 Mod. Astronomer Mar. 54/1 Accessories include a star diagonal and Kellner eyepieces of 25 millimetres (×35.4) and 10 millimetres (×91) focal length. II. Simple uses. 2. A Kellner eyepiece. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > lens > [noun] > eye-piece eyeglass1665 ocular1702 eyepiece1729 Ramsden1787 field glass1797 negative eyepiece1831 positive eyepiece1842 Kellner1865 orthoscopic1868 eye-point1875 comparison eyepiece1940 1865 Proc. Royal Soc. 14 46 Having..determined the positions of the spots, I replace the Kellner by ordinary (negative) eyepieces. 1922 L. Bell Telescope vi. 145 The Kellner is decidedly valuable as a wide field positive ocular. 1969 Jrnl. Brit. Astron. Assoc. 79 p. ii/2 (advt.) We have designed and manufactured a first-class ortho of ⅓″ focus and 45° field... Barlows, Ramsdens, Kellners stocked. 1995 Sky & Telescope May 8/3 The effect is most pronounced in the least complex eyepieces, such as Kellners and Plössls. This is a new entry (OED Third Edition, September 2002; most recently modified version published online March 2022). < n.1865
随便看	θ193814 θ193815 θ193816 θ193817 θ193818 θ193819 θ19382 θ193820 θ193821 θ193822 θ193823 θ193824 θ193825 θ193826 θ193827 θ193828 θ193829 θ19383 θ193830 θ193831 θ193832 θ193833 θ193834 θ193835 θ193836