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Wheelco, Barber Coleman, Leeds & Northrop device
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Wheelco, Barber Coleman, Leeds & Northrop device
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I'm not sure what this is other than an enigma to me. Wooden box measures 9" tall by 5" across and 8 1/4" deep. Two metal brackets on top but no strap. Metal plate that says "Battery" and up arrow with the word "Up". Front of box has a metal label "Manufactured by Wheelco Instruments Div. Barber-Coleman Company, Rockford, Illinois, U.S.A., Serial 45H0795, Model 310". On the side is a Metal wheel that turns and I think charges a generator inside. Box is skinned up but very well intact. Open lid and you have a thermometer that measures 140F to 40F. Two sets of positive and negative knobs. An amp meter with the range of +30 to -30. Calibrate this meter by turning the knob on the top of the meter. Thin metal needle under plastic. Top of knob reads Leeds & Northrup Co., Philadelphia. 2nd measuring device has numbers on the left from 0 to 34 and on the right side, 30 to 64. The red needle under the plastic is bent upwards. Marked MV. Spine the wheel on the right side of the box and Amp meter moves. Knob that is marked L S H. Weighs 10 pounds before packing. Information from a very sweet ebayer: Okay, let's see. 40-140 degrees is a fairly wide range but it seems to be measuring ambient air temperature. That's a range one would expect in, say, some workshops or facilities like a generator room. The Low-Standard-High switch may be adjusting the innards according to the temperature range. The + and - knobs look like binding posts to attach wires to so it can be connected to some external device. (Why two sets? Who knows.) That the ammeter is moving when you spin the wheel implies a generator of some sort with something to load it a little so the ammeter can work. MV would be megavolts if it's being used normally but it could also be millivolts (which is supposed to be mV) if whoever made the machine didn't realize the difference. Megavolts makes more sense since that sort of output is what one would use to test insulation breakdown and other properties. Millivolts, on the other hand, would be adequate for some shock treatments since it's the current that does the work. I tend to shy from that one since Barber Colman is (was?) an industrial company, not medical. Leeds & Northrop was an excellent company with a reputation for quality from around (maybe slightly before) the turn of the century up until the 60s or so when it started spinning off divisions. I believe it's completely gone now which is sad. Anyway, that the manufacturer used a Leeds & Northrop meter implies they were also going for quality. Barber Colman would do that. If this came with medical equipment, it was probably used to test the integrity of the wiring.
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