Product images of Portable reflector telescope
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Portable reflector telescope
This is a portable Gregorian (reflector) telescope. It is signed JAMES SHORT LONDON 208/1205 = 18 meaning it has a focal length of 18 inches (457.2mm), and that James Short had made 208 of that size out of a total 1205 telescopes by the time he made this one. This telescope is similar to one used by James Cook on his 1769 expedition.
The barrel is made from brass. It has adjustable inclination and rotary movement (or altitude and azimuth movement). Attached to the top of the barrel is a refracting telescopic sight. There is an eyepiece cap and two brass eyepieces. The longer of the two is 97 mm the shorter and more powerful eyepiece is 77 mm. Within the barrel are primary and secondary (objective) specula (mirrors). There is a screw thread for the focusing of the secondary mirror which is done through use of the rod attached to the barrel. There is a spare secondary mirror in a tin box which gives a higher power to each eyepiece. The length with the larger eyepiece is 707 mm. The height to the top of the sight is 550 mm, the diameter of the barrel is 105 mm and has 457.2mm (18 inch) focal length.
- Image reference: D3357
- National Maritime Museum, Greenwich, London