Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 709
686 EXPERIMENTAL SCIENCE. long, 7 inches wide at the middle, and tapering to 2 inchesat the ends ; two disks of elastic rubber, each 11 inches indiameter and ^V inch thick; one small scoop net; 3 inchesof f brass tubing; three small hinges; a spiral bed spring,and two iron straps. The 10 X II inch… … Blowpipe Bellows. by the valve shown at 3. The valve consists of a softpiece of leather, having attached to it two wooden blocks,one of which is fastened to the board in position to holdthe other in the position of use. These blocks are beveledso as to give the valve sufficient lift and at the same…
Physics · Lantern projection · Electric apparatus and appliances
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