Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 366
-. A great deal depended on the PHOTOGRAPHY. 343 quality of the lenses of the camera. The exposure in thebest cameras was reasonably short. The old time gallery,with its antiquated camera and fixtures, and the dark roomwith the appurtenances, are faithfully represented an the … engravmgs (Figs. 325 and 326). After exposure, the platewas taken to another dark room for development. It wasplaced face downward over a ifaring iron vessel (Fig. 327),in the bottom of which there was a small quantity of puremercury. The mercury was maintained at a temperature of 344 EXPERIMENTAL…
Physics · Lantern projection · Electric apparatus and appliances
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