Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 179
objectmoves, the image will move the contraryway. u This appearance of the image in theair, b tween the mirror and the object, hasbeen productive of many dec ptions, which,when < xhibited with art, aud an air ofmystery, have beea a source of gain topublic show-men. I he images of objectshavj… … HE question of the velo-city of electricity has verymuch occupied the atten-tion of philosophers forthe last twenty yeais. In1834, Mr. Wh atstonew& first attempted to ascer- tain and exp ess this velocity bynumbers, but succeeded only in es-tablishing an inferior limit whichfell short of the…
Photography · Art and photography
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