Part of a Newbegin variable P filter

Part of a Newbegin variable P filter made of metal. The part is circular and has a hole at the centre with 1/12 engraved near the hole.

Object Details

ID: AST0929.25
Type: Part of a Newbegin variable P filter
Display location: Not on display
Creator: Unknown
Date made: Unknown
Credit: National Maritime Museum, Greenwich, London
Measurements: Overall: 6 mm; Diameter: 22 mm
Parts: Newbegin telescope (Telescope)