Italian circumferentor ('ipodimeter') with eccentric alidade, 17th century.

Italian circumferentor ('ipodimeter') with eccentric alidade, 17th century.
2 9 c m
40cm
actual image size: 32cm x 21cm

Description

The inner scale on the circle of this circumferentor is engraved; 'Aqvilo solanvs evrvs avster africvs favonivs chavrvs septent'. Circumferentors (with a full circle scale) and graphometers (with a half circle scale) were widely used through the 17th and 18th centuries for angle measurement. A joint on the support allowed for both vertical and horizontal use. The sights on this instrument are set off to one side.

© Science Museum / Science & Society Picture Library

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