t casts the deeper shadow.—The lights arc placed in such a manner that the two shadows ofthe rod, which are cast so as to be in juxtaposition, are of the5ame depth or intensity, when the illuminating powers of thelights are compared by comparing their distances from therod. Thus, the magnitude of… … 168. Ritchies Pho- Fig. 17.tometcr, Fig. It, con-sists of a box a b about8 or 10 inches in lengthand 1 inch in diameter,and having in the mid-dle a small triangularwedge, -with its sides,m s, m g, inclined at anangle of about 45 de-grees to the bottom. This wedge is iiuaiiy cu\L-red with…
Physics
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