TRANSACTIONS OF SECTION A. 447 



microphone being used as transmitter, consisting of two pieces of carbon, touching 

 slightly ; one of the connecting wires resting over an upright msteboard box into 

 which the sounds were directed. 



_ The author also stated that he had found that sounds could be obtained 

 without a magnet, the receiver being simply a piece of tin around which a few 

 yards of copper wire is wound. An arrangement of this kind was exhibited with 

 which various microphone phenomena had been obtained ; the sounds, however, 

 being much reduced in loudness. 



SATURDAY, AUGUST 17, 1878. 

 The Section did not meet. 



