Engraving by J Asperne. Dollond (1730-1820) worked with both his father John Dollond and nephew George Dollond. In 1765 he invented the triple achromatic lens by combining two convex lenses of crown glass with one double-concave lens of flint glass. In 1758 he presented his achromatic telescope to the Royal Society and was awarded the Copley Medal. He improved the astronomical refracting telescope and navigation instruments. Published in the 'European Magazine', 1820.
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