Graphometer-clinometer, c 1600.
3 4 c m
actual image size: 32cm x 26cm

Graphometer-clinometer, c 1600.

© Science Museum / Science & Society Picture Library


Circumferentors (with a full circle scale) and graphometers (with a half circle scale) such as this example made by Philippe Danfrie, were widely used in the 17th and 18th centuries for angle measurement. A joint on the support allowed for both vertical and horizontal use. Philippe Danfrie is credited with the original design of the graphometer, publishing a book on the subject in the 1590s.

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