Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 368
means of a spirit lamp until athin film of gold was deposited upon the plate and the pic- Fig. 328. … Fixing. ture attained the desired tone. The plate was then washedin clean water, and finally dried evenly and quickly over aspirit lamp. Fig ?2q r -I
Physics · Lantern projection · Electric apparatus and appliances
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