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Details
A late 19th-Century surveyor's folding rule, level and compass,
signed DOLLOND LONDON, the hinge incorporating a clinometer scale, the upper boxwood section rule with twin folding sights and bubble level, the lower rule with bubble level and folding miniature compass with edge-bar needle, the upper and lower rules divided with a scale for degrees per inch and horizontal distance scales -- 12in. (30.5cm.) long fully open
See Illustration
signed DOLLOND LONDON, the hinge incorporating a clinometer scale, the upper boxwood section rule with twin folding sights and bubble level, the lower rule with bubble level and folding miniature compass with edge-bar needle, the upper and lower rules divided with a scale for degrees per inch and horizontal distance scales -- 12in. (30.5cm.) long fully open
See Illustration