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Terry Foreman   Link to this

Francis Smethwick (fl. 1667-85). Amateur optical instrument-maker; F.R.S 1667. He invented a method of grinding non-spherical glass.

L&M Companion

Terry Foreman   Link to this

On Grinding Optic and Burning Glasses of Non-Spherical Figures: By Francis Smethwick, Esq. F. R. S. N° 33, p. 631.

http://books.google.com/books?id=92lnIw3oKGMC&p...

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