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Scientific American, Vol. 62, No. 16 (1890) (1890)
leaf 7
is again warmed. Finally, the surface of the paraffin pole of the bat- is covered with white paint, so that the curves appear tery is inserted a black on a white ground. Very well defined figures bell, c. A key, d, may thus be obtained. Asimilar and simpler process is included in a consists in… … front of the funnel, and at the side of the bell, ¢, ie belt from the pulley, E, on the motor shaft. To the Fig. 5.-WHISTLES FOR PRODUCING BEATS, © 1890 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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