K-factor drift rates in suspended gyroscopes

The object of this paper is to record and analyze the results of an investigation into the 'K-factor' drift rates of four Wild GAK-1 gyro-theodolite attachments. In order to yield results of real significance, a carefully planned program of measurements by experienced observers, over a period of three years, under ideal laboratory conditions has been conducted and the results summarized. The investigations have shown that the 'K-factor' cannot be considered a constant because even after short time intervals a fresh determination of its value is required in order to obtain optimum results. The necessity of frequent calibration checks when correlating underground and surface surveys has again been emphasized.