Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 183
gathering portions of the sound that might escape theunaided ear. The reflector is adjusted by looking through the ear i6o EXPERIMENTAL SCIENXE. trumpet toward the small plane mirror, and moving thesound reflector until the source of sound is seen in the mir-ror. The reflector is then focused by… … concavity is reached, which will be when sounds are dis-tinctly heard in the ear trumpet. The air is readilyexhausted from the reflector by applying the mouth tothe mouthpiece. The details of the construction of theapparatus are shown in the engraving. SOUND. I6l Of course, the operation of the…
Physics · Lantern projection · Electric apparatus and appliances
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