The May 1955 issue of Popular Electronics detailed a build-it-yourself lie detector using a 3S4 amplifier and a Wheatstone Bridge to measure resistance between fingers on opposite hands.

A Wheatstone bridge is one of those handy circuits that has plenty of uses in both AC and DC measurements. ... Luckily, resistance temperature detectors (RTDs) are an excellent alternative.

This article was originally published with the title “ Wheatstone Bridge for Resistance Thermometry ” in SA Supplements Vol. 79 No. 2044supp (March 1915), p. 148 doi:10.1038 ...