Large Jennings Vacuum Spark Gap for Radio Coil Wireless Telegraph Morse

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Large Jennings Vacuum Spark Gap for Radio Coil Wireless Telegraph Morse:
$9.99

Large Jennings R9G vacuum variable spark gap. The end of the shaft is threaded. Were you to add a nut or knob, you could adjust the gap from nothing to about 1 inch. Very handy because it contains all the ozone and stink that spark gaps make. It measures over 10\" long!
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