Daily entries from the 17th century London diary
Francis Smethwick (fl. 1667-85). Amateur optical instrument-maker; F.R.S 1667. He invented a method of grinding non-spherical glass.
On Grinding Optic and Burning Glasses of Non-Spherical Figures: By Francis Smethwick, Esq. F. R. S. N° 33, p. 631.
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