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Telescope (detail)

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probably made in London

Telescope (detail)
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This is a detail of a refracting telescope made in 1765, probably by Peter Dollond, a scientific instrument maker based in London.

The detail shows the inscription on the telescope's single brass draw tube. It reads 'PETRUS DOLLOND/ Ann. Dom. 1765/ LONDINIUM'.

In 1758, Dollond's father, John, a Spitalfields weaver, patented his achromatic doublet lens. In 1765, a further improvement was made by Dollond himself using a double-concave flint glass cemented to two double convex lenses of crown glass.

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