| http://www.w3.org/ns/prov#value | - Examples of the invention are illustrated in the accornpanying diagrammatic drawings in which: FIG. 1 is a fragmentary longitudinal section through the centre line of two releasably interlocked mating staffs of a measuring instrument; FIG. 2 is a cross-section taken on the line AA in FIG. 1; FIG. 3 is a fragmentary plan view of the parts of FIG. 1; FIG. 4 is a view similar to FIG. 1 but with the l
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