Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 274
ut till now invisible, on theplate, begins to appear ; the operator as-sures himself of the progress of this develop-ment by examining the picture through theglass, g, by a taper, taking care that therays do not fall too strongly on the plate,and injure the nascent images. The opera-tion is… … is completed before the thermometer hasfallen to 55° cent. (131° Fahr.) This is,however, always known by observing thesketch through the glass. 266 The Photographic Art Journal, November, After each, operation the apparatus iscarefully cleaned in every part, and inparticular the strips of metal…
Photography · Art and photography
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