Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 700
OPERATIONS. 677 size is reached. The wooden rim may be turned off in posi-tion by using a pointed tool. The lathe above described, although very easily madeand inexpensive, will be found to serve an excellent purposefor all kinds of hand work, driUing, polishing, lens making,wood and brass turning… … Tempering Small Drills. trated in Fig. 648. It consists in heating the drill to a cherryred, and immediately plunging it into a ball of beeswax.This operation will give the drill the proper temper for allordinary work, and will leave it tough and strong. KNURLING.It is often desirable to knurl or…
Physics · Lantern projection · Electric apparatus and appliances
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