For a period during the 1960s and 1970s every larger Colchester lathe was issues with not only a standard inspection form (shown at the bottom of the page) but a certificate showing the results of testing a turned sample on a Talyrond machine. This ingenious device (one of several types of high-precision testers made by the Taylor-Hobson Company and widely used throughout industry) was able to produce a trace that depicted, using an exaggerated trace, any deviation from true roundness to an accuracy of one-hundredth thousandth of an inch..