These look like resistance demonstrators for physics labs; slide potentiometers. Those devices were made very hardy back then, and while they can easily be replaced by a precision bournes pot or a used Tegam resistance box, you have it why not use it?
Just make sure the contacts are clean and be wary with the conductors exposed, its a shock hazard. Given the printed rating its rated for 425 Watts, when it was new. At 05:03 PM 7/28/2013, Joseph Gray wrote:
I know someone who has several of these old style resistors. Can anyone tell me anything about them? Are they of any use? https://dl.dropboxusercontent.com/u/19599147/Resistor%20-%20side.jpg https://dl.dropboxusercontent.com/u/19599147/Resistor%20-%20front.jpg Joe Gray W5JG __
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