Galilean telescope (spyglass) with triple achromatic object glass
- maker:
- Benjamin Martin
Galilean telescope (spyglass) with triple achromatic object glass, 4-power eye-piece, in black fish-skin case by Benjamin Martin, London, England, c. 1782. Fitted with slotted bracket for tripod. Lacking the dust-cap for the object glass
Details
- Category:
- Optics
- Object Number:
- 1918-145
- Materials:
- copper (alloy), glass, wood (unidentified), paper (fibre product), cardboard and fish skin
- Measurements:
-
object: x 120 mm x , 40 mm,
case: x 120 mm x , 15 mm,
overall weight: x x , , .255kg
- credit:
- Court, Thomas Henry
