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MR JAMES BLYTH ON THE TELEPHONE AND MICROPHONE. 559 
In my next experiment I tried if the jar with the cinders would act as receiver 
as well as transmitter, and was not a little surprised to find that it did so. For 
this purpose I used similar jars of cinders, both for transmitter and receiver, and 
included a battery of two Grove’s cells in the circuit. Articulate sounds 
uttered in the one cinder jar were distinctly heard in the other, and even voices 
could be distinguished. The results, however, were not so good as I have no 
doubt they will yet be when better forms of transmitter and receiver are used. 
I also tried successfully an ordinary telephone as transmitter and a jar of 
cinders as receiver. In this case, however, the sounds were somewhat fainter, 
and not so easily distinguished. I remarked that when an intermittent current 
was sent through the jar of cinders, a very distinct rattling noise issued from it. 
In order to find out if the cinders in the receiving jar were at all jostled about 
while sounds were being transmitted to it from a similar jar, the following plan 
was adopted :—A strong battery was included in the circuit and a clear glass 
yessel containing the cinders taken as receiving jar. When this was taken 
into a dark room, on looking through the cinders, small flashes of light were 
here and there seen among the cinders when sounds were being transmitted. 
