Table for reducing to seconds of space, the readings of a Micrometer screw, where value = 20".10 for / revolution

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Piece of folded paper with two adjustment tables on it. The paper is printed with small, blue squares and has hand written tables in black ink.

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ID:	AST0938.4
Type:	Adjustment tables
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	National Maritime Museum, Greenwich, London, Caird Collection
Measurements:	Overall: 186 mm x 232 mm
Parts:	Portable reflector telescope (Telescope) Telescope Shade (AST0938.1) Telescope Shade (AST0938.2) Telescope Stand (AST0938.3) Table for reducing to seconds of space, the readings of a Micrometer screw, where value = 20".10 for / revolution (Adjustment tables) (AST0938.4) Telescope box (AST0938.5)