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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.Some of the Resistance Bridges were used to locate shorts in long runs of multi-conductor cable.L & N was purchased by General Signal Company in the mid-1990s. This L&N box differs from the "shunt-pin" type of R box in that the resistance value desired is just "dialed-in" with the switches. The hard rubber used in L&N equipment has a tendency to turn brown with long-term exposure to light. As can be seen from the property asset decal on the front, this instrument was used a Mount Wilson Observatory.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.Biddle was also a very early major builder and supplier of wireless equipment with Reginald Fessenden being one of his prominent customers over a long period of time.At the budget-built end, there were the countless test-gadgets intended for radio repairmen or radio hobbyists that might seem to barely be able to perform the intended task but clever designs sometimes resulted in very useful test instruments.

L&N was a major supplier of various types of devices that were used for industrial calibration of temperature sensors and associated temperature monitoring instruments.

These would be thermocouples, RTDs and other temperature sensors or transducers.

L&N built precision resistance devices including decade boxes, various types of elaborate potentiometers, fixed resistances along with sensitive galvanometers, individual component-type Wheatstone Bridges and many other types of instruments.

Most of these types of devices used nickel-chromium wire wound on ceramic forms.

All of these rheostats will have a slide adjustment to vary the value of resistance (or voltage when connected as a potentiometer) as necessary for the experiment.

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.