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Title: The Determination Of Specific Gravity
Author: C. T. Gill
Source: 1941 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1941
Abstract: A discussion of the determination of specific gravity would be incomplete without a brief review of the various methods that have been used, or are In use today, Probably the first method In general use was the direct weighing of a sample of the gas in a chemical balance. This method, while very accurate, was at least inconvenient. Later the effusion method was hitroduced, but this proved disappointing. Due to the inability to obtain ideal conditions, it was impossible to obtain consistent results. Witli the introduction of the Edwards balance, accurate field determinations became an actuality, and due to the simplicity of construction, and the basic principles on which it operated, the method became a standard within itself. Although the Edwards balance was rather delicate for field testing, this objection was overcome in balances of later design, such as tlie Ac-me and the Anubis. The American Meter Company instrument is something rather different from the usual design, in that the pressure developed by a constant speed fan is calibrated to bo read directly in specific gravity.

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