Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 137
Boomeranfr. 114 EXPERIMENTAL SCIENCE. smoker forming such wreaths with his mouth. These ringsare simply whirling masses of air revolving upon axes curvedin annular form, the smoke serving to mark the projectedand whirling body of air, thus distinguishing it from thesurrounding atmosphere. The… … itex Rine-s. All the apparatus needed for producing vortex rings atwill is an ordinary pasteboard hat box, having a circular holeof 4 or 5 inches diameter in the cover. Two pads of blot-ting paper are prepared, each consisting of six or eightpieces. Upon one pad is poured a small quantity of…
Physics · Lantern projection · Electric apparatus and appliances
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