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Hand-operated grinding/polishing machine, 1780-1820.

Hand-operated grinding/polishing machine, 1780-1820.
3 1 c m
actual image size: 32cm x 23cm


This hand operated grinding/polishing machine was constructed and used by the famous English astronomer, Sir William Herschel (1738-1822). It was employed to shape and polish small speculum (metal) mirrors of around 6-inch (15cm) aperture that were fitted in his 7-foot telescopes. To produce the necessary motions in the machine, it is fitted with offset-pivots, levers and a racket mechanism. This device may be the only complete surviving example of a grinding/polishing machine made by Sir William Herschel.

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© Science Museum / Science & Society Picture Library

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