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The end faces of outside calipers should be curved in their widths, as in Fig.

These are known as inside or outside calipers, depending upon the measurements they are intended to take.

Back, tee and centering square; bevels, spirit level, inside and outside calipers, straight edges, rules and surface plates p.

A pair of outside calipers form an excellent example in vice work.

If the joints of outside calipers are well made the calipers may upon small work be closed upon the work as in Fig.