. lateral advantages the exclusion of dirt, sand, or other abrad- B? is a hollow iron ball which forms the pole of the magnet,| An exhibit which will probably attract the attention of | ing material from the bearing surfaces of axles and boxes. D_ This bali should be made very thin and covered… … sound waves made before transmitter, A, and .except when it is to be raised by the working will reproduce by means of telephone, E, any MAGNETIC THERMOPHONE WITH REFLECTING DIAPHRAGM TRANSMITTER. levers. sound made before transmitter, A. Messrs. Frank Baldwin, of New York, and The operation of…
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