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This balance was used by the Institute for National Measurement Standards at the National Research Council (NRC) in Ottawa, Ontario, from 1938 to 1997. It may have been made by A. Rueprecht & Sohn of Vienna, Austria.
NRC scientists used this unique apparatus to meet stringent requirements of modern mass determinations. The balance was capable of measuring kilograms with precision greater than 0.02 to 0.03 mg. This was achieved by automating the process of moving masses and weights, using lasers to read and graph measurements, and maximizing advances in computer control.
From 1938 until it was decommissioned in 1997, this was Canada’s primary balance used to make kilogram mass comparisons. It was, therefore, the most important piece of equipment for mass measurement in Canada; for almost 60 years, all mass standards were compared to results achieved with this instrument.
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