Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 136
by a locomotive; similar rings may often be noticedafter the firing of a gun. It is not uncommon to see a … 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…
Physics · Lantern projection · Electric apparatus and appliances
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