Slow motion line adjustment

Slow motion line adjustment. Cook 6-inch refractor telescope. This is the Cook No. 2 telescope

Object details

ID: ZBA0757.20
Type: Slow motion line adjustment
Display location: Not on display
Creator: Unknown
Date made: Unknown
Credit: National Maritime Museum, Greenwich, London
Measurements: Overall: 240 mm x 190 mm x 180 mm
Parts: Cooke refractor telescope (Telescope)