Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 361
who found it alight business, requiring little capital and returning largeprofits. The plates employed were copper faced with silver. Themetal was hard-rolled, and the plates, as received from the Fig. 321. … Scouring the Plate. manufacturers, were flat and quite smooth, but notpohshed.The first step toward the preparation of tlie plate for usewas to chp the corners and turn down the edges slightly, ina machine designed for the purpose, to bring the sharpedges of the plate out of reach of the buff…
Physics · Lantern projection · Electric apparatus and appliances
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