An 18th-century brass alidade-rule, unsigned , engraved with scales, with one chamfered edge 18t 1/8in. (46cm.) long ; brass square with linear scales labelled a,b,c,d,e,f,g , with shaped ends; another brass square engraved I Pryor circa 1700; and a pair of Napier-type pocket compasses
An 18th-century brass alidade-rule, unsigned , engraved with scales, with one chamfered edge 18t 1/8in. (46cm.) long ; brass square with linear scales labelled a,b,c,d,e,f,g , with shaped ends; another brass square engraved I Pryor circa 1700; and a pair of Napier-type pocket compasses
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
