Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 205
her end of the spring is attached to astud projecting from the board. The pullej-s are of differ-ent diameters, so that each series forms a cone. By this con-struction the wire of one convolution is prevented from cov-ering the wire of the next. The last pulley of the upper series is provided with… … Metallic Thermometer. ten convolutions of wire, so that a small change of tempera-ture produces sufficient expansion of the wire to cause aperceptible movement of the index. To increase the sensi-tiveness of the instrument, the wire is blackened by meansof smoke or dead black varnish. An electric…
Physics · Lantern projection · Electric apparatus and appliances
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