Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 685
- the same method. HCiW TO PERFORATE GLASS. To make a small hole in a plate of glass is a comparativelysimple matter. All that is required to do it i.^ a yery hard,sharp drill, some means for turning it, and a lubricant, such Fig 63q … Softening the Shank of a Drill. as turpentine, ior causing the drill to cut rapidly. A drillmade in the usual form from steel wire and hardened byheating it until it is dark red and then plunging it in mer-cury, will be yery hard, but not tough. Before the drill isheated it should be driyen into a…
Physics · Lantern projection · Electric apparatus and appliances
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