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Title: Operation Of Gravity Balance
Author: C. T. Gill, D. A. Silleks
Source: 1929 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1929
Abstract: In discussing the Gravity Balance and its use in the determination of specific gravity of gas it is almost a necessity to give a brief resume of the history. The balance was evolved to fill a great need for an accuratci method of determining gravity in the field. Previous to this time the Schilling or Botde method had been used or else the gas was shipped in cylinders to a central laboratory where the gravity was determined by direct weighing on a chemical balance. In the case of the first method i.e. the bottle,-due to the inability to obtain constant conditions, accurate determinations were not possible. The second method, while accurate enough, was, to say the least, inconvenient.

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