Although the water microphone was commercially impractical, the variable resistance feature inspired Thomas Edison to experiment with dry carbon ( graphite and amorphous ) to provide the variable resistance.
22.
A string potentiometer is a multi-turn potentiometer operated by an attached reel of wire turning against a spring, enabling it to convert linear position to a variable resistance.
23.
Bell supporters feel this proves that Bell not only had a good understanding of undulating current and variable resistance, but in fact his knowledge was superior to that of Gray.
24.
Semiconductor devices can display a range of useful properties such as passing current more easily in one direction than the other, showing variable resistance, and sensitivity to light or heat.
25.
By shaping the bars to change the resistance of the winding portions in the interior and outer parts of the cage, effectively a variable resistance is inserted in the rotor circuit.
26.
The means of doing this was not standardised, Praktica's method was to use an electrical connection which transmitted a variable resistance value to the camera's metering circuit.
27.
:The term " microphone " for a telephone transmitter based on imperfect, variable resistance contact between carbon pieces or even metallic contacts, is credited to David E . Hughes.
28.
Bell testified that he wrote the sentences containing the variable resistance feature before January 18, 1876, " almost at the last moment " before sending his draft application to his lawyers.
29.
In cases where a design calls for one input to be short-circuited to ground, that short circuit can be replaced with a variable resistance that can be tuned to mitigate the offset problem.
30.
The Bell Company based their patent claims on Berliner's variable resistance, metallic contact transmitter, which was ok as a demonstration, but which required frequent adjustment to maintain intelligible transmission of speech.
