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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.

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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.

Otto Wolff, from 1900 to 1909, produced the Reichsanstalt-type of resistance standards used at the National Bureau of Standards (NBS.) At the turn of the last century, many precision measurements had to be calculated because the measurement couldn't be made directly since many of the instruments we take for granted today hadn't been developed.

A known precision resistance allowed one part of the equation to be selected and the remainder was then calculated.

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.