Preliminary Note on Mechanical Actions of Sound, Produced by a Telephone Receiver

Abstract

The paper describes with photograplic illustrations, some remarkable mechanical actions of sound, produced by a telephone-receiver traversed by an alternating current of telephonic fequency and rather big amount. They are:
(I) Attraction or repulsion between a suspended disc and a sounding receiver, etc.
(II) Pumping action of sound or a receiver, etc. (Remarkable and believed new. See Fig. 2.)
(III) Driving of a small wheel by air currents induced by sound (See Fig. 4.) and Sacking up of powder along inside a tube and blowing it out through a side hole, etc. (Remarkable and believed new. See Fig. 5.)
(IV) Dancing of grains of powder between the cap of a sounding receiver and a hori-zontal plate, etc.
General remarks and explanations are also given respectively before and after these descriptions.