A JIG is a device used to ensure that all the members of a batch of articles are alike. In its simplest form, it is known as a template; which, however, only ensures uniformity so long as each article is accurately made to the shape of the template, the accuracy depending to a considerable extent on the skill of the operator.
Handasyde, G.H. (1932), "Jigs for Aircraft Construction: A Survey of Current Practice with some Suggestions for Improvement and Wider Application", Aircraft Engineering and Aerospace Technology, Vol. 4 No. 6, pp. 143-145. https://doi.org/10.1108/eb029555
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