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Title: Specific Gravity Insturments-Care And Operation-A Demonstration
Author: W. R. Gay
Source: 1969 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1969
Abstract: 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.

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