Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 38
consequence of this an easy and effective method of spin-ning, and finally it requires a good bearing, having a mini-mum of friction. The top illustrated has these three requisities. It weighs3^ pounds, and its weight might be increased somewliatwith advantage. It has a frictional spinning device… … l6 EXPERIMENTAL SCIENCE. turns on an agate or steel step.* It is almost perfectlybalanced, and the friction of its bearing is very slight.When unencumbered, it will run for over 42 minutes in theopen air with once spinning, and its motion may at anytime be accelerated without stopping, by a new…
Physics · Lantern projection · Electric apparatus and appliances
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