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Title: Recording Instruments For Temperature And Pressure
Author: E. T. Oettinger
Source: 1956 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1956
Abstract: The recording instruments for temperature and pressure which are covered in this paper are of the type that are generally referred to as the mechanical type to differentiate froni the various electrical devices. Mechanical temperature and pressure instruments are basically the same. In a Pressure Recorder the change in pressure is picked up in a sensing element within the instrument, which in turn causes a change in the position of the pointer or pen. In a temperature instrument we are really sensing pressure, the pressure being varied by either the volumetric change in a solidly filled system or the change in vapor pressure in a vapor pressure actuated svstem.

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