Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 402
e with an angle of 60° cut out of it; CHAP. XXVI.] LIGHT AND HEAT OF THE STARS. 379 another plate slides over the first in such a manner thatits edge forms a base for the V-shapecl opening, thusforming an equilateral triangular hole, which is adjust-able at pleasure by moving the second plate. The… … Fig. 166.—Bouguers Photometer. Let the gas flame be supposed to represent a constantlight at constant distance; then the intensity of thelight to be experimented upon (represented by thecandle) is determined by moving it towards or from themirror till the ilhimination of both the halves of…
Astronomy · Telescopes
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