. The London, Edinburgh and Dublin philosophical magazine and journal of science . rapolation in order to obtain the value ofthe solar constant within the limits of our atmosphere ; but themethod which I have followed renders it much more precise,and I think that the numbers which I have obtained representthe temperature of the sun in a satisfactory manner. This willbe rendered evident by a perusal of the present memoir. I. Description of the Instruments employed in the Researches. 1st, Thermoelectric Piles.—In my experiments I have usedtwo piles—one made by M. Duboscq, and the other by
. The London, Edinburgh and Dublin philosophical magazine and journal of science . rapolation in order to obtain the value ofthe solar constant within the limits of our atmosphere ; but themethod which I have followed renders it much more precise,and I think that the numbers which I have obtained representthe temperature of the sun in a satisfactory manner. This willbe rendered evident by a perusal of the present memoir. I. Description of the Instruments employed in the Researches. 1st, Thermoelectric Piles.—In my experiments I have usedtwo piles—one made by M. Duboscq, and the other by The one made by M. Duboscq (No. 1) was composed of25 antimony-bismuth elements arranged in the form of astraight prism with a square base ; the junctures of the metalswere placed at the base of the prism, and were covered withlampblack. The first rod of bismuth and the last of antimonywere in communication with two insulated coils of wire in whichthe rheophors were fixed. The pile was protected by a smallbrass case with double wall (fig. 1) in which were two apertures. opposite to two sides of the pile. The pile was situated inthe centre of the case and was kept in position by a piece of on the Temperature of the Sun, 327 metal, 0. The case was in the form of a straight prism witha rectangular base. Each base, back and front, was mo-vable, and had in its centre a window, which admitted the raysas far as the junctures in the pile. These windows could, how-ever, be closed by double shutters working in horizontalgrooves set in the outer wall of the case. The interior wallsof the case were covered with lampblack; they could not,however, radiate towards the faces of the pile, because thelatter were protected by two tubes E E, E E (rectangular insection), which were slightly divergent towards the exteriorand reached nearly as far as the windows of the case. Thecase with the pile could be inclined more or less to the horizonby means of a toothed pinion, Gr, worked by a rack,
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