Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 158
Waves. 136 . EXPERIMENTAL SCIENXE. With a continuous speaking-tube explosive sounds areliable to extinguish the ilame, but this difficult)- ma_y beavoided by cutting a longitudinal slit, an inch or so in length,in the speaking-tube near the mouthpiece. When sounds are uttered in the mouthpiece with…
Physics · Lantern projection · Electric apparatus and appliances
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