The fleming valve
detector consists of a carbon or tungsten filament lamp,
in the bulb of which is also included a metal plate
insulated from the filament, and the connecting wire of
which is brought through the glass wall of the bulb to a
third terminal outside. If the filament be rendered
incandescent by the application of a suitable battery to
its terminals the space between the filament and the
insulated plate will be found to possess an unilateral
conductivity, and if it be now included in a ciruit in
which oscilations are taking place it will by its
rectifying action convert them into an unidirectional
current capable of actuating a telephone receiver.
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