This image is released under a Part of circular instrument dividing engine.
"Four foot" circular dividing engine (c. 1778) by John Troughton, diameter of wheel to edge of teeth is 46 1/4 inches, with 2160 teeth, wooden treadle missing, and also a few unimportant details such as milled-head screws, near the 210 degree mark seven teeth are partly burred
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Completed by John Troughton (c 1739-1807), this is similar to the first successful dividing engine which was completed in about 1775 by Jesse Ramsden (1735- 1800). Until the 1770s, scales on scientific instruments had been marked out by skilled craftsmen in a process called 'dividing', this was partly mechanized from the 1770s when dividing engines were introduced. Originally used on small instruments, by the 1850s they were used to graduate scales on large astronomical telescopes, making hand-dividing obsolete.
- Measurements:
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overall: 1080 x 1300 x 1200 mm
- Object Number:
- 1932-22 Pt1
- type:
- circular dividing engine and component - object
