Repeating circle; Sight tube

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Repeating circle sight tube.

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ID:	NAV0075.4
Type:	Repeating circle; Sight tube
Display location:	Not on display
Creator:	Heather, William
Date made:	circa 1810
Credit:	National Maritime Museum, Greenwich, London, Adams Collection
Measurements:	Diameter: 23 mm;Overall: 91 mm
Parts:	Repeating circle Reflecting circle; Box (NAV0075.1) Repeating circle; Telescope (NAV0075.2) Repeating circle; Telescope (NAV0075.3) Repeating circle; Sight tube (NAV0075.4) Repeating circle; Draw tube (NAV0075.5) Repeating circle; Shaded eyepiece (NAV0075.6) Repeating circle; Handle (NAV0075.7) Repeating circle; Screwdriver (NAV0075.8) Repeating circle; Adjusting pin (NAV0075.9) Repeating circle; Magnifying glass (NAV0075.10)