If the audible effect is due to variations in the resistance fo the
circuit, then the sound should be increased by increasing the amplitude of
the vibration of the platinum wire or by increasing the resistance of the
liquid conductor.
Fig 2 shows a means of
increasing both the resistance and the amplitude of vibration. m is a
membrane. A the mouthpiece. S a wooden style arranged as in Morey's improvement of the Phonautograph. PP' a bridge of platinum wire. CC' Two metal cups containing
water.
R Receiving Instrument. Fig 3 shows another form
of Transmitter M membrane. P'P2 Bridge of platinum wire. The ends pass
through two holes in the wooden guard gg'. P.P3 two fixed platinum points.
It seems to me that
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