Portable telescope

The barrel of this achromatic telescope is covered in dyed rayskin (shagreen). It has four draw tubes made of green vellum, except for the second draw tube, which is covered in dark green paper and may be a later replacement. Most of the fittings are brass and include a sliding eyepiece cover, although the objective lens cap is missing.

The maker's name is stamped onto the largest draw tube. Stop lines drawn on the draw tubes (shown as rings of dots) indicate the optimum viewing length of the telescope.

Object Details

ID: NAV1502
Collection: Astronomical and navigational instruments
Type: Portable telescope
Display location: Not on display
Creator: Dollond, Peter
Date made: circa 1780
Credit: National Maritime Museum, Greenwich, London, Caird Collection
Measurements: Length: 399 mm (closed), 1355 mm (open, to stop lines, max); Diameter: 52 mm (barrel), 56 mm (max)