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Title: Recording Instruments For Temperature And Pressure
Author: E. T. Oettinger
Source: 1955 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1955
Abstract: This paper is limited to a discussion of recording instruments for temperature and pressure of the type commonly referred to as mechanical to differentiate them from the various electrical devices. Both temperature and pressure instruments of the mechanical type are basically the same. In the case of the pressure recorder the change in pressure is picked up on a sensing element within the instrument, which in turn gives a change in the pointer or pen. In the case of the 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 acutated system.