Herschelianadj.n.

/həˈʃɛlɪən/

Etymology: < the name of the astronomer Sir William Herschel (1738–1822) and his son Sir John Herschel (1792–1871) + -ian suffix.

Of or relating to Sir William Herschel or his son Sir John Herschel. Herschelian telescope n. a form of reflecting telescope having a concave mirror slightly inclined to the axis. Herschelian rays n. the ultra-red heat rays of the spectrum, the existence of which was first proved by Sir W. Herschel.

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

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

specular1651

Newtonian1737

Gregorian1762

Herschelian1792

Cassegrainian1813

1792 Philos. Trans. (Royal Soc.) 82 310 I looked at the planet with an Herschellean four and seven-feet reflector.

1837 C. R. Goring & A. Pritchard Micrographia 155 The Newtonian and Herschelian telescopes having very small angles of aperture, will admit of concave metals with spherical figures.

1840 Proc. Amer. Philos. Soc. 1838–40 1 58 A seven feet Herschelian.

Derivatives

Herˈschelic adj. = main sense.

ΚΠ

1874 J. Fiske Outl. Cosmic Philos. I. i. 19 Beyond the red..lie the so-called Herschellic rays, of least refrangibility.

This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2018).

单词	herschelian
释义	Herschelianadj.n. /həˈʃɛlɪən/ Etymology: < the name of the astronomer Sir William Herschel (1738–1822) and his son Sir John Herschel (1792–1871) + -ian suffix. Of or relating to Sir William Herschel or his son Sir John Herschel. Herschelian telescope n. a form of reflecting telescope having a concave mirror slightly inclined to the axis. Herschelian rays n. the ultra-red heat rays of the spectrum, the existence of which was first proved by Sir W. Herschel. 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 the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [adjective] > telescope > reflecting telescope specular1651 Newtonian1737 Gregorian1762 Herschelian1792 Cassegrainian1813 1792 Philos. Trans. (Royal Soc.) 82 310 I looked at the planet with an Herschellean four and seven-feet reflector. 1837 C. R. Goring & A. Pritchard Micrographia 155 The Newtonian and Herschelian telescopes having very small angles of aperture, will admit of concave metals with spherical figures. 1840 Proc. Amer. Philos. Soc. 1838–40 1 58 A seven feet Herschelian. Derivatives Herˈschelic adj. = main sense. ΚΠ 1874 J. Fiske Outl. Cosmic Philos. I. i. 19 Beyond the red..lie the so-called Herschellic rays, of least refrangibility. This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2018). < adj.n.1792
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