Tangent screw

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Tangent screw made of metal with textured edges.

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ID:	NAV1242.12
Type:	Tangent screw
Display location:	Not on display
Creator:	Ramsden, Jesse
Date made:	circa 1792
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Diameter: 13 mm;Overall: 24 mm
Parts:	Sextant with Artificial Horizon Sextant box (NAV1242.1) Bottle (NAV1242.2) Miscellaneous metal items (NAV1242.3) Bottle (NAV1242.4) Lamp (NAV1242.5) Attachment (NAV1242.6) Box (NAV1242.7) Telescope (NAV1242.8) Artificial horizon (NAV1242.9) Sight tube (NAV1242.10) Telescope bracket (NAV1242.11) Tangent screw (NAV1242.12) Sextant handle (NAV1242.13)