diathermancyn.

/dʌɪəˈθəːmənsi/

Etymology: < French diathermansie, formed by Melloni, 1833, < Greek διά through + θέρμανσις heating, < θερμαίνειν to heat. The French ending follows the analogy of paralysie for Greek παράλυσις. The English ending simulates the -ncy of transparency, buoyancy. Melloni's original term was diathermanéïté, < diathermane adjective ( Ann. Chim. et Phys. 1833, LIII. 59, LV. 396, Phil. Mag. 1835 VII. 476); the latter was, according to him, ‘ < διά + θερμαίνω, in imitation of diaphane, < διά + ϕαίνω to show.’ But the analogy was not exact: diaphane is not derived < διά and ϕαίνω, only from the same root; and in θερμαίνω, -αίνω does not belong to the root, but is a verbal suffix, the stem being θερμ-. Diathermane was first rendered in English diathermal, but after 1837 generally diathermanous. To express the notion of ‘coloration ou teinte calorifique’, Melloni introduced diathermansie, < Greek διά + θέρμανσις heating ( Ann. Chim. et Phys. LV. 377). But the distinction between diathermanéïté and diathermansie appears not to have been generally appreciated; in the English translation of Melloni's paper in Taylor's Scientific Memoirs, 1837, I. 72, diathermancy is used for both French words, and English writers generally have used it in the sense of Melloni's diathermanéïté. For these and other reasons, Melloni afterwards ( Comptes Rendus, 1841, XIII. 815) abandoned his original terms, and gave a new nomenclature: viz. diathermique adjective, instead of diathermane; diathermasie ( < Greek διαθερμασία) in place of diathermanéïté; and thermochrose for diathermansie ‘colouring or tint of heat’, with corresponding adjective thermochroïque. But, though some English writers have thence used diathermic and diathermacy, most have continued to employ diathermanous and diathermancy, the latter in the sense not of Melloni's diathermansie, but of his diathermanéïté or diathermasie.

Physics.

†1. originally. The property, possessed by radiant heat, of being composed of rays of different refrangibilities, varying in rate or degree of transmission through diathermic substances; thermochrosy n.; also called heat-colour. Obsolete.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > heat > transmission of heat > [noun] > perviousness

diathermaneity1835

diathermancy1837

transcalescence1850

diathermanism1858

diathermacy1867

transcalency-

the world > matter > physics > electromagnetic radiation > heat > transmission of heat > [noun] > variation in refrangibility

diathermancy1837

thermochroology1847

thermochrosy1864

1833 Melloni in Ann. Chim. et Phys. LV. 377 Les rayons calorifiques..possèdent, pour ainsi dire, la diathermansie propre à chaque substance qu'ils ont traversée. [Note] Je prends diathermansie comme l'équivalent de coloration ou teinte calorifique.]

1837 tr. M. Melloni in R. Taylor Sci. Mem. I. 61 The calorific rays..possess (if we may use the term) the diathermancy peculiar to each of the substances through which they have passed. [Note] I employ the word diathermancy as the equivalent of calorific coloration or calorific tint.

1837 tr. M. Melloni in R. Taylor Sci. Mem. I. 69 They diminish the quantity of heat transmitted by the glass without altering its diathermancy [Fr. diathermansie].

2. Now: The property of being diathermic or diathermanous; perviousness to radiant heat; = diathermaneity n.

ΚΠ

1833 Melloni in Ann. Chim. et Phys. LV. 396 Les couleurs introduites dans un milieu diaphane diminuent toujours plus ou moins sa diathermanéïté.]

1837 tr. M. Melloni in R. Taylor Sci. Mem. I. 72 The colours introduced into a diaphanous medium always diminish its diathermancy in a greater or less degree.

1843 A. Smee Sources Physical Sci. 194 The extent to which interposed bodies allow radiation is called the extent of diathermancy.

1857 W. Whewell Hist. Inductive Sci. (ed. 3) II. 399 Their power of transmitting heat, which has been called diathermancy.

1863 J. Tyndall Heat ix. 296 Diathermancy bears the same relation to radiant heat that transparency does to light.

1893 Brit. Med. Jrnl. 1 Apr. 684/1 Perhaps the diathermancy is the most striking feature of mountain climates, as it affords an explanation of the great solar temperatures which prevail during the day..and of the great nocturnal radiation.

This entry has not yet been fully updated (first published 1895; most recently modified version published online September 2019).

单词	diathermancy
释义	diathermancyn. /dʌɪəˈθəːmənsi/ Etymology: < French diathermansie, formed by Melloni, 1833, < Greek διά through + θέρμανσις heating, < θερμαίνειν to heat. The French ending follows the analogy of paralysie for Greek παράλυσις. The English ending simulates the -ncy of transparency, buoyancy. Melloni's original term was diathermanéïté, < diathermane adjective ( Ann. Chim. et Phys. 1833, LIII. 59, LV. 396, Phil. Mag. 1835 VII. 476); the latter was, according to him, ‘ < διά + θερμαίνω, in imitation of diaphane, < διά + ϕαίνω to show.’ But the analogy was not exact: diaphane is not derived < διά and ϕαίνω, only from the same root; and in θερμαίνω, -αίνω does not belong to the root, but is a verbal suffix, the stem being θερμ-. Diathermane was first rendered in English diathermal, but after 1837 generally diathermanous. To express the notion of ‘coloration ou teinte calorifique’, Melloni introduced diathermansie, < Greek διά + θέρμανσις heating ( Ann. Chim. et Phys. LV. 377). But the distinction between diathermanéïté and diathermansie appears not to have been generally appreciated; in the English translation of Melloni's paper in Taylor's Scientific Memoirs, 1837, I. 72, diathermancy is used for both French words, and English writers generally have used it in the sense of Melloni's diathermanéïté. For these and other reasons, Melloni afterwards ( Comptes Rendus, 1841, XIII. 815) abandoned his original terms, and gave a new nomenclature: viz. diathermique adjective, instead of diathermane; diathermasie ( < Greek διαθερμασία) in place of diathermanéïté; and thermochrose for diathermansie ‘colouring or tint of heat’, with corresponding adjective thermochroïque. But, though some English writers have thence used diathermic and diathermacy, most have continued to employ diathermanous and diathermancy, the latter in the sense not of Melloni's diathermansie, but of his diathermanéïté or diathermasie. Physics. †1. originally. The property, possessed by radiant heat, of being composed of rays of different refrangibilities, varying in rate or degree of transmission through diathermic substances; thermochrosy n.; also called heat-colour. Obsolete. ΘΚΠ the world > matter > physics > electromagnetic radiation > heat > transmission of heat > [noun] > perviousness diathermaneity1835 diathermancy1837 transcalescence1850 diathermanism1858 diathermacy1867 transcalency- the world > matter > physics > electromagnetic radiation > heat > transmission of heat > [noun] > variation in refrangibility diathermancy1837 thermochroology1847 thermochrosy1864 1833 Melloni in Ann. Chim. et Phys. LV. 377 Les rayons calorifiques..possèdent, pour ainsi dire, la diathermansie propre à chaque substance qu'ils ont traversée. [Note] Je prends diathermansie comme l'équivalent de coloration ou teinte calorifique.] 1837 tr. M. Melloni in R. Taylor Sci. Mem. I. 61 The calorific rays..possess (if we may use the term) the diathermancy peculiar to each of the substances through which they have passed. [Note] I employ the word diathermancy as the equivalent of calorific coloration or calorific tint. 1837 tr. M. Melloni in R. Taylor Sci. Mem. I. 69 They diminish the quantity of heat transmitted by the glass without altering its diathermancy [Fr. diathermansie]. 2. Now: The property of being diathermic or diathermanous; perviousness to radiant heat; = diathermaneity n. ΚΠ 1833 Melloni in Ann. Chim. et Phys. LV. 396 Les couleurs introduites dans un milieu diaphane diminuent toujours plus ou moins sa diathermanéïté.] 1837 tr. M. Melloni in R. Taylor Sci. Mem. I. 72 The colours introduced into a diaphanous medium always diminish its diathermancy in a greater or less degree. 1843 A. Smee Sources Physical Sci. 194 The extent to which interposed bodies allow radiation is called the extent of diathermancy. 1857 W. Whewell Hist. Inductive Sci. (ed. 3) II. 399 Their power of transmitting heat, which has been called diathermancy. 1863 J. Tyndall Heat ix. 296 Diathermancy bears the same relation to radiant heat that transparency does to light. 1893 Brit. Med. Jrnl. 1 Apr. 684/1 Perhaps the diathermancy is the most striking feature of mountain climates, as it affords an explanation of the great solar temperatures which prevail during the day..and of the great nocturnal radiation. This entry has not yet been fully updated (first published 1895; most recently modified version published online September 2019). < n.1837
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