crystal set ( synonym found)
Definition of crystal set:

°An early radio receiver, having no electrical power supply except the radio waves themselves; it used a crystal of lead or cadmium sulphide and a wire (the Cat's whisker) touching the crystal's surface.
Definition of crystal set:

°An early radio receiver, having no electrical power supply except the radio waves themselves; it used a crystal of lead or cadmium sulphide and a wire (the Cat's whisker) touching the crystal's surface.
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