Crystal radios are fascinating in that they use no batteries and no wall socket electricity.  They get their power solely from the antenna to which they are clipped.

     This 1959 Aud-Ion has only three parts inside.  The rotating dial moves a cam that actuates an iron core within a coil, thus changing the tuning.  There is no on-off switch or volume control.

     I remember clipping a radio like this to the bedsprings at night and listening to whatever KBYG had to offer, which wasn't  much.

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