Circular instrument dividing engine (Watts No. 1) made by George W. Watts, London, England in 1905. An automatic dividing engine, complete with test circle.
Watts No.1 automatic circular dividing engine, constructed by George. W. Watts in 1905
Test circle produced on the Watts No.1 automatic circular dividing engine, constructed by George. W. Watts in 1905. Sent to Germany to be tested, the scale engraved on the silver ring had an average error of only 0.5 seconds of arc, or one part in 2592000.
Certificate for Watts No.1 Circular instrument dividing engine, made by George W. Watts, London, England in 1905.
Certificate titled 'Prufungsfchein', awarded when the automatic circular dividing engine was tested.
