Summary
The accuracy is equal to that of the best mercury barometers. The instrument has substantial advantages over mercury-based ones. The accuracy of the latter depends mainly on how accurately the temperature correaction (about 140μ Hg per °C) is made. The correction is smaller by a factor 18 for the piston barometer. The care needed in controlling the temperature is thus much less, and the results are more reliable.
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Additional information
Author's certificate No. 63541 of July 2, 1939 for a piston barometer.
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Indrik, P.V. Indrik's weight-and-piston barometer. Meas Tech 2, 108–109 (1959). https://doi.org/10.1007/BF00974343
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DOI: https://doi.org/10.1007/BF00974343