Diagram for reading time from latitude?

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ID:	ZBA1710.3
Type:	Diagram for reading time from latitude?
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	P&D. National Maritime Museum, Greenwich, London, RGO Collection
Measurements:	Overall: 1 mm x 227 mm x 225 mm
Parts:	Diagram for reading time from latitude? Diagram for reading time from latitude? (ZBA1710.1) Diagram for reading time from latitude? (ZBA1710.2) Diagram for reading time from latitude? (ZBA1710.3)