Speculum mirror of of 4 3/8-inch aperture for Gregorian telescope by James Short
Speculum mirror of of 4 3/8-inch aperture for Gregorian telescope by James Short, London [42/1195 = 24].
- Measurements:
-
overall: 10 x 110 mm
- Object Number:
- 1939-389 Pt1
- type:
- components , concave mirrors and metal mirrors