This is an NBS-type four terminal resistance standard. Cosmetic condition is very good, however one of the four clamp screws is missing.
Two values each were given in the L&N specification sheet on the 4015-B Series resistors (both current and amperage) – possibly one value was for the resistor used dry, the other for an oil-immersed resistor? I give both values in the specs I copied below. This resistor is older than the B-series so the specifications may not be accurate.
10 ohm – (model 4025?), serial number 659194, 0.1 (0.3) amps, 0.1 (1) watts, nominal adjusted value 0.003%, measured value 0.0001%. Last calibrated in 1958 at L&N – stated value 10.0049. Also a Dymo label with the figure 10.0063.
The standard is oil-immersed and has a rubber adhesive patch placed over the thermometer access port to stem leakage during transport. There is no data or calibration label on the resistor, but it was included in a box of standards that came from the calibration laboratory at Leeds & Northrup. The resistor was measured with a Fluke 8060 meter just to confirm that it was close to the nominal stated value, and that it had not been damaged..
Photo set 1682.
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