Spyglass achromatic telescope signed Dollond London 18th

Spyglass-telescope-dollond-18

The wooden barrel of this Galilean telescope is covered in dyed rayskin (shagreen), while the single draw tube is made of brass. A thumbwheel on the eyepiece allows the viewer to select one of four lenses of different magnifying powers. The lenses are numbered from 1 to 4 and there are numbered stop lines on the draw tube, indicating the optimum length corresponding to each of these lenses.

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