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I was given these boxes by my old Virginia City friend, Maynard Clark who worked at Mount Wilson Observatory (Maynard designed much of the computer software for the various telescope drive systems at Mt.Wilson.) These large, adjustable wire-wound rheostat-potentiometers were generally used in college and university physics laboratories when performing experiments in electricity where fairly large currents were involved.Rogers Nov, 2014 These two precision resistance boxes were built in Berlin by Otto Wolff and date from around 1900. Biddle of Philadelphia imported these instruments and each box has his tag attached.

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The long shunt pin with knurled nut allows connection as a potentiometer if desired.

Morris Leeds and Edwin Northrup started Leeds & Northrup in 1903 in Philadelphia, PA to supply precision instruments for scientific experimentation within laboratories, colleges and universities and precision test and calibration instruments for industrial applications.

The large knob is original and has JAGABI embossed on it - JAGABI was the trade name for James G. The JAGABI rheostat shown is 52 ohms total R, rated at 5.0 Amps. The small German rheostat shown is 48 ohms, only rated at 1.5 Amp - six inches long.

Central Scientific Company was located in Chicago, IL and generally built various types of devices for laboratory experimental use, mainly for schools, colleges and universities.

Laboratory R-C-L Devices, Diagometers & Test Kits, RF Signal Generators, Freq Measuring Instruments, AF Oscillators, Voltage Measuring Instruments, C-L-R-Z-Q Measuring Instruments, Vacuum Tube Testers, Oscilloscopes, Panadapters, Xmtr Modulation Monitors, Digital V & F Measuring Instruments, Test Bench Power Supplies, Variable Voltage Xmfrs, Miscellaneous Instruments Test instruments that are built to a high-quality standard are generally referred to as "Laboratory Equipment." Some of the test equipment used in early laboratories may seem archaic and useless today but their purpose and operation is interesting and historically important.

Some of the test and monitoring equipment for the military was the best that could be produced at the time and no expense was spared in its construction.Next one has to look at the specific resistance values shown next to the junction slots.These values show how much resistance is to be subtracted if the junction is shunted by a pin.Early resistance boxes require some calculation as to how to achieve the desired resistance from the placement of the various shunt pins into the numerous junction slots.Each junction slot can shunt the resistor selected by inserting the shunt-pin.Some of the Resistance Bridges were used to locate shorts in long runs of multi-conductor cable.

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