Translation:Note on the article on the ascent of clouds
Physics.[3]
In the somewhat hasty composition of this article we said, on page 160, that experience directly proved that during the night the clouds still maintain a temperature higher than that of the surrounding air, since they send us more heat. To this reasoning one may object that all the excess heat is perhaps due to their reflective power. But then precisely because they reflect the radiant heat emanating from the globe better than does the surrounding air, they must appropriate more of it.[4] Moreover, if we note that the particles of the cloud, far from acting like a metallic mirror, disperse in all directions the radiant caloric that they reflect, and that being formed of liquid or solid water they have only a weak reflective power, we will perceive that a considerable part of the heat sent must come from the cloud's own temperature.
Notes[edit]
- ↑ Original: A. Fresnel, "Note relative à l'article sur l'ascension des nuages, inséré dans la Livraison d'octobre", Bulletin de la Société Philomathique for Dec. 1822, p. 198; reprinted (without the title) in H. de Sénarmont, E. Verdet, and L. Fresnel (eds.), Oeuvres complètes d'Augustin Fresnel (hereinafter cited as Oeuvres complètes), vol. 2 (1868), p.665n (cf. pp. 665 & 666 at French Wikisource). The original note appears after an extrait of the celebrated memoir on the circular birefringence of quartz (Zenodo: 4745976). The reprint appears as a footnote to the article to which it refers.
- ↑ A. Fresnel, "Sur l'ascension des nuages dans l'atmosphère", Annales de Chimie et de Physique, Ser. 2, vol. 21, pp. 260–63 (Nov. 1821); reprinted in Bulletin de la Société Philomathique for Oct. 1822, pp. 159–60; reprinted in Bibliothèque Universelle (Sciences et Arts), vol. 21, no. 4 (Dec. 1822), pp. 255–8; reprinted in Oeuvres complètes, vol. 2 (1868), pp. 663–6; translated as "On the ascent of clouds in the atmosphere", Quarterly Journal of Science, Literature, and the Arts, vol. 15, pp. 165–6 (1823).
- ↑ Marginal note in the original.
- ↑ The surrounding air is evidently assumed to be transparent, not absorbent, to the radiant heat.
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