tithonometern.

Brit.

/ˌtɪθə(ʊ)ˈnɒmᵻtə/,

/ˌtʌɪθə(ʊ)ˈnɒmᵻtə/, U.S.

/ˌtɪθəˈnɑmədər/,

/ˌtaɪθəˈnɑmədər/

Origin: From a proper name, combined with an English element. Etymons: proper name Tithonus , -ometer comb. form.

Etymology: < the name of Tithonus (see tithonic adj.) + -ometer comb. form. Compare tithonic adj., tithonize v., tithonograph n.

Photography. Now historical.

In the terminology of John William Draper: an instrument for measuring the intensity of tithonic rays. See tithonic adj.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [noun] > energy causing chemical changes > instrument for measuring

tithonometer1842

1842 J. W. Draper in London, Edinb., & Dublin Philos. Mag. 21 455 Such words as Tithonoscope, Tithonometer, Tithonography, Tithonic effect, Diatithonescence, are musical in an English ear. In this paper I shall therefore use the term Tithonicity and its derivatives.

1843 J. W. Draper in London, Edinb., & Dublin Philos. Mag. 23 401 Description of the Tithonometer, an instrument for measuring the Chemical Force of the Indigo-tithonic Rays.

1917 Proc. Royal Soc. London A. 93 p. vi After many fruitless attempts they succeeded in constructing an apparatus in which the defects of Draper's ‘tithonometer’ were obviated.

2013 Educación Química 24 216/2 By 1843 he [sc. Draper] had photographed spectral lines and developed a sensitive instrument, the tithonometer, for measuring the intensity of chemically active rays.

This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2022).

单词	tithonometer
释义	tithonometern. Brit. /ˌtɪθə(ʊ)ˈnɒmᵻtə/, /ˌtʌɪθə(ʊ)ˈnɒmᵻtə/, U.S. /ˌtɪθəˈnɑmədər/, /ˌtaɪθəˈnɑmədər/ Origin: From a proper name, combined with an English element. Etymons: proper name Tithonus , -ometer comb. form. Etymology: < the name of Tithonus (see tithonic adj.) + -ometer comb. form. Compare tithonic adj., tithonize v., tithonograph n. Photography. Now historical. In the terminology of John William Draper: an instrument for measuring the intensity of tithonic rays. See tithonic adj. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [noun] > energy causing chemical changes > instrument for measuring tithonometer1842 1842 J. W. Draper in London, Edinb., & Dublin Philos. Mag. 21 455 Such words as Tithonoscope, Tithonometer, Tithonography, Tithonic effect, Diatithonescence, are musical in an English ear. In this paper I shall therefore use the term Tithonicity and its derivatives. 1843 J. W. Draper in London, Edinb., & Dublin Philos. Mag. 23 401 Description of the Tithonometer, an instrument for measuring the Chemical Force of the Indigo-tithonic Rays. 1917 Proc. Royal Soc. London A. 93 p. vi After many fruitless attempts they succeeded in constructing an apparatus in which the defects of Draper's ‘tithonometer’ were obviated. 2013 Educación Química 24 216/2 By 1843 he [sc. Draper] had photographed spectral lines and developed a sensitive instrument, the tithonometer, for measuring the intensity of chemically active rays. This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2022). < n.1842
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