Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 252
rotat-ing it, i. c, if it is given the same motion that is required torinse out a pail, the circle will revolve around its center inthe same direction that the drawing moves. A black circle (Fig. 236) having a number of equidistantinternal teeth is provided for the second experiment, thedrawing… … son has shown these figures on a screen on a large scale,and by moving the plates as before described, the figureson the screen were made to rotate.* When viewed in a microscope under certain conditions,the minute markings of some of the diatoms appear as hex-agons, while under other conditions,…
Physics · Lantern projection · Electric apparatus and appliances
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