Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 686
OPERATIONS. 663 way of hardening- a drill for perforating glass is to heat thedrill to a dark red, then plunge it into a strong solution ofzinc chloride. This is prepared by dissolving zinc in muri-atic acid. Zinc should be gradually added until the actionceases. The drill prepared in this way… … Perforating Glass. enlarged by means of a sharp round file wet with turpen-tine. When larger holes are required, these cannot con-veniently be made with a drill. A copper or brass tubecharged with emery and water or emery and turpentine,and rotated in contact with the glass, will soon cut a hole…
Physics · Lantern projection · Electric apparatus and appliances
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