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Title: Specific Gravity Instruments-Care And Operationa Demonstration
Author: W. R. Gay
Source: 1965 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1965
Abstract: The Arcco-Anubis Gas Gravitometer, a direct weighing type instrument, was discussed. The gravitometer is constructed to measure the difference in specific gravity of a column of gas and an equal column of dry air. This difference is transmitted to a chart on which is recorded the specific gravity of the gas passing through the instrument. The instrument consists of two identical bells, an air bell and a gas bell, which are suspended at equal distances from the fulcrum of the balance beam. The purpose of the air bell is to compensate for the weight of the gas bell and the surface tension of the sealing liquid in which the two bells are suspended. The interior space of the air bell is open to the atmosphere through an air inlet and outlet which contain a drying agent. The interior space of the gas bell is open to the atmosphere through its outlet and the gas supply is admitted through its inlet. Two vertical tubes of adequate height to obtain the required working force on the bells are connected at their bases to the inside space of the bells. The movement of the bells is transmitted through the balance beam of the recording mechanism.

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