Clocks: plan of a dividing engine for setting out gearwheels. Engraving by Defehrt [after G. d'Heuland].

Licence: Public Domain Mark

Credit: Clocks: plan of a dividing engine for setting out gearwheels. Engraving by Defehrt [after G. d'Heuland]. Wellcome Collection. Source: Wellcome Collection.