nsists of a highly polished lateral advantages the exclusion of dirt, sand, or other abrad ists. thin mirror, similar to Prof. Bell's photophone transmitter; ing material from the bearing surfaces of axles and boxes. An exhibit which will probably attract the attention of B! is a hollow iron ball… … sound waves made before transmitter, A, and except when it is to be raised by the working MAGNETIC THERMOPHORE WITH REFLECTING DIAPHRAGM TRANSMITTER. levers. will reproduce by means of telephone, E, any Messrs. Frank Baldwin, of New York, and sound made before transmitter, A. the plant in all…
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