Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 15
amera-obscura, or darkened cham-ber, was the invention of Baptista Porta,of Padua. Its principle will be best un-derstood by the very simple experiment ofdarkening a room by closing the window-shutters and boring a small hole in them.If a piece of paper is held at a little dis-tance from this hole,… … 10 If, instead of a darkened room, we sub- effect will be seen to result. Suppose, ingtitute a darkened bos (Fig. 10) the same | the first place, the box to be within the 1S52. The Photographic Art-Journal. lens, the rays would pass from the externalarrow in nearly right lines through theopening,…
Photography · Art and photography
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