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Published online by Cambridge University Press: 28 July 2016
“Potential” leads are used to put strain gauge switches and leads in series with high resistance ratio arms in a modified Wheat-stone Bridge. Thus the effects of switch contact resistance change and temperature-resistance change in leads can be minimised to any desired values. The high resistance ratio arms allow coarse resistance changes at the measuring bridge to measure the small resistance change at the gauge due to strain.
High potentials are applied to the bridge to minimise the effects of thermal e.m.f.
Active gauges and the temperature compensating gauges are in circuit for only a few seconds while the measurement is made.
The circuits proposed here were communicated to the Aeronautical Research Council, National Physical Laboratory, January 1946 and placed on Restricted Circulation. The data on gauge drift with time and current were noted and discussed with the A.R.C. in March 1946. Publication is now made by agreement with the Aeronautical Research Council.