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MANGANIN WIRE RESISTANCE UNIT, 1930's
Manganin was used in the 1930's as a replacement for Nickel Silver used up until then.
Manganin and Ureka wire was superceded by Nickel Copper and Nickel Chrome Alloys.
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- The 'hole' in the middle is for the thermometer. Many of these resistors were in a 'pot' and suitable oil was put in, to keep the coils at a steady temperature (to be stated on the calibration certificate).
.......... Dave Coomber, Penkridge, 27th of August 2014