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John Dollond, English optician, mid 18th century.

Smith, J R

John Dollond, English optician, mid 18th century.
4 0 c m
actual image size: 24cm x 32cm


Engraving made c 1761 by J R Smith after a painting by B Wilson. John Dollond (1706-1761), the son of a Huguenot refugee, had been a silk-weaver but in 1752 he joined his son Peter in busines as an optician. Dollond invented achromatic (almost colour-free) lenses for refracting telescopes and microscopes. Isaac Newton (1642-1727) had thought chromatic aberration (colour fringes in images produced by a simple lens) were inherent. Dollond also invented the heliometer, a telescope used for finding the angular distance between two stars.

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