Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 272
^^N K\5\>$^ Mica Cone. and turned and marked in a similar wa). The cone isthen cemented by its edges to the sheet, the marked edgesof both members being arranged in the same direction. The Maltese cross shown in Fig. 262 is revoluble. The Fig. 262. … Maltese Cross. iirst Step toward the preparation of this object is to secure apin head downward on a square of glass with sealing waxor other cement. A small paper tube which will fit the pinloosely is then made, and a little head of sealing wax isformed around the tube near one end. A piece of…
Physics · Lantern projection · Electric apparatus and appliances
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