- Subject
- Optical instruments
- Item type
- Object
- Provenance
- Not ascertained.
- Primary inscriptions
- Unsigned and undated.
- Object type
- Prism
- Dimensions
- Diameter: 105mm
- Inventory No
- 15078
Description
Copper alloy cylindrical case, painted black, with projecting centrally from the top a thick copper alloy rod terminating in a screw-thread and nut, this is attached to a copper alloy mounting inside the case securing a large right-angled prism. This is revealed when the lid of the case is unscrewed.
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