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Title: Recording Instruments
Author: A. G. Koenig
Source: 1940 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1940
Abstract: The term recording instrument covers a wide variety of instruments designed to record almost any measurement which is capable of being made today. We are therefore limiting this paper to the two recording instruments most widely used by the gas industry, namely recording pressure gauges and recording thermometers. Almost all recording pressure gauges and thermometers of the pressure spring type as used in industrial practice today employ some form of Bourdon tube as the measuring element. The Bourdon tube is named after the French Engineer Eugene Bourdon, who in 1S49 made the accidental discovery that flattened and bent tubes tend to straighters under pressure, which led him to the invention of a pressure gauge using the expansion of a curved tube. The Bourdon tube is made in three major forms: the circular, the spiral, and the helical or involute Bourdon tube. The circular tube is mainly used in indicating gauges while the spiral and the helical tubes, because of their greater movement, are ideal for recording instruments. One end of the Bourdon tube is securely fastened to the instrument base and has the pressure connection, while the free and closed end carries the pen arm or is connected to it by the necessary movements.

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