‎"POUILLET, (CLAUDE-SERVAIS-MATHIAS). - THE SOLAR CONSTANT DETERMINED.‎
‎Mémoire sur la chaleur solaire, sur les pouvoirs rayonnants et absorbants de l'air atmosphérique, et sur la témperature de l'espace.‎

‎(Paris, Bachelier), 1838. 4to. No wrappers. In: ""Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences"", Tome VII, No 2. Pp. (23-) 92. (Entire issue offered). Pouillet's paper: pp. 24-65. In the text illustrations of the Pyrheliometer, constructed by Pouillet in this connection. Clean and fine.‎

Reference : 58200

‎First appearance of this importent paper being the first quantitaive measurement of the Solar Constant, the total radiation energy received from the Sun per unit of time per unit of area on a theoretical surface perpendicular to the Sun’s rays and at Earth’s mean distance from the Sun.‎