Herscheln.

/ˈhəːʃəl/

Etymology: < the name of Sir William or Sir John Herschel (see Herschelian adj.).

Astronomy.

A name proposed (and to some extent used) for the planet now called Uranus, after its discoverer, Sir William Herschel in 1781.

ΘΚΠ

the world > the universe > planet > primary planet > superior planet > [noun] > Uranus

Georgian planet1782

Georgium Sidus1782

Uranus1783

Herschel1813

1813 J. M. Good et al. Pantologia Herschel, the name by which several astronomers call the primary planet discovered by Dr. Herschel in March 1781.

1878 S. Newcomb Pop. Astron. 355 Herschel proposed to call the new planet Georgium Sidus..Lalande thought the most appropriate name of the planet was that of its discoverer, and therefore proposed to call it Herschel.

Compounds

Used attributively or in the possessive to designate certain phenomena or principles discovered by or related to the work of Sir William or Sir John Herschel.

Herschel condition n. (also Herschel's condition) a condition that must be satisfied by a system of lenses if spherical aberration is to be absent in the images of two neighbouring objects.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > light > refraction > [noun] > law or condition

Snell's law1873

Herschel condition1910

1910 J. P. C. Southall Princ. & Methods Geom. Optics xii. 394 It has..been suggested that the other requirement should be the so-called Herschel-Condition; that is, that the function ϕ₁Z₁ + ϕ₂Z₂ should vanish not only for the particular value of x₁ but also for object-points on the axis very near to the point M₁ to which the value x₁ belongs.

1932 A. C. Hardy & F. H. Perrin Princ. Optics vi. 98 The condition that n sin ¹/ ₂θ/n′ sin ¹/ ₂θ′ = a constant must be satisfied for all values of θ. This is commonly called the Herschel condition although it had not been formulated mathematically when Herschel constructed his objective.

1957 R. S. Longhurst Geom. & Physical Optics xiv. 280 Herschel's condition is the condition that must be satisfied if the system is to form, simultaneously, a good image of a neighbouring axial object point.

Herschel effect n. the partial destruction of the latent image on a photographic negative by the action of infra-red radiation.

ΘΚΠ

society > leisure > the arts > visual arts > photography > a photograph > qualities and effects > [noun] > Herschel effect

Herschel effect1909

1909 Jrnl. Chem. Soc. 96 ii. 141 Warnerke's modification of the Herschel Effect and the Preparation of the Substance of the Latent Image.

1932 A. C. Hardy & F. H. Perrin Princ. Optics xi. 233 This Herschel effect has a very important significance in connection with theories of the latent image but has not been found very useful as a technique for infrared photography.

Herschel's fringes n. spectral fringes observed in a prism standing on a plane mirror at the line of separation between the brighter field, due to incident light internally reflected by the prism, and the darker field, due to light externally reflected by the mirror, first observed by Sir William Herschel.

ΚΠ

1890 T. Preston Theory of Light viii. 153 (heading) Herschel's fringes.

This entry has not yet been fully updated (first published 1898; most recently modified version published online September 2019).

单词	herschel
释义	Herscheln. /ˈhəːʃəl/ Etymology: < the name of Sir William or Sir John Herschel (see Herschelian adj.). Astronomy. A name proposed (and to some extent used) for the planet now called Uranus, after its discoverer, Sir William Herschel in 1781. ΘΚΠ the world > the universe > planet > primary planet > superior planet > [noun] > Uranus Georgian planet1782 Georgium Sidus1782 Uranus1783 Herschel1813 1813 J. M. Good et al. Pantologia Herschel, the name by which several astronomers call the primary planet discovered by Dr. Herschel in March 1781. 1878 S. Newcomb Pop. Astron. 355 Herschel proposed to call the new planet Georgium Sidus..Lalande thought the most appropriate name of the planet was that of its discoverer, and therefore proposed to call it Herschel. Compounds Used attributively or in the possessive to designate certain phenomena or principles discovered by or related to the work of Sir William or Sir John Herschel. Herschel condition n. (also Herschel's condition) a condition that must be satisfied by a system of lenses if spherical aberration is to be absent in the images of two neighbouring objects. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > refraction > [noun] > law or condition Snell's law1873 Herschel condition1910 1910 J. P. C. Southall Princ. & Methods Geom. Optics xii. 394 It has..been suggested that the other requirement should be the so-called Herschel-Condition; that is, that the function ϕ₁Z₁ + ϕ₂Z₂ should vanish not only for the particular value of x₁ but also for object-points on the axis very near to the point M₁ to which the value x₁ belongs. 1932 A. C. Hardy & F. H. Perrin Princ. Optics vi. 98 The condition that n sin ¹/ ₂θ/n′ sin ¹/ ₂θ′ = a constant must be satisfied for all values of θ. This is commonly called the Herschel condition although it had not been formulated mathematically when Herschel constructed his objective. 1957 R. S. Longhurst Geom. & Physical Optics xiv. 280 Herschel's condition is the condition that must be satisfied if the system is to form, simultaneously, a good image of a neighbouring axial object point. Herschel effect n. the partial destruction of the latent image on a photographic negative by the action of infra-red radiation. ΘΚΠ society > leisure > the arts > visual arts > photography > a photograph > qualities and effects > [noun] > Herschel effect Herschel effect1909 1909 Jrnl. Chem. Soc. 96 ii. 141 Warnerke's modification of the Herschel Effect and the Preparation of the Substance of the Latent Image. 1932 A. C. Hardy & F. H. Perrin Princ. Optics xi. 233 This Herschel effect has a very important significance in connection with theories of the latent image but has not been found very useful as a technique for infrared photography. Herschel's fringes n. spectral fringes observed in a prism standing on a plane mirror at the line of separation between the brighter field, due to incident light internally reflected by the prism, and the darker field, due to light externally reflected by the mirror, first observed by Sir William Herschel. ΚΠ 1890 T. Preston Theory of Light viii. 153 (heading) Herschel's fringes. This entry has not yet been fully updated (first published 1898; most recently modified version published online September 2019). < n.1813
随便看	crescentwise cricketbat maker cricketed cricketer cricketers cricketess cricketing cricketloving cricketmad cricketplaying cricketress crickets cricketstaff crickety crickey crickeys cricking crickle crickle-crackle cricklecrackle crickling cricks crico crico- cricoarytenoid