Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 344
eantime remains comparatively cold. Move theluminous spot to the unblackened portion of theglass. The spot becomes only shi^htly heated.Place a piece of paper behind and in contact withthe glass, and it qnickly burns. Whether we receive heat from the sun ornot, it is evident that we receive… … 322 RADIANT ENERGY.—LIGHT. a—^ rotates with tlie greatest freedom. To the extremities of eachof tlie lour arms of the vane are attached disks of aluminumwhich are white on one side and black on the other. The wholeis enclosed in a glass bulb from which the air is exhausted tillless than -pjVtj ^^…
Physics
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