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Micrometer filter eyepiece?

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Object details

ID:	AST0800.15
Type:	Micrometer filter eyepiece?
Materials:	Metal; Glass
Display location:	Not on display
Creator:	Troughton & Simms
Date made:	circa 1850
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Diameter: 30 mm;Overall: 10 mm
Parts:	Micrometer head Micrometer head part (AST0800.1) Micrometer head part (AST0800.2) Micrometer eyepiece mount with eyepiece (AST0800.3) Micrometer eyepiece mount cap (AST0800.4) Micrometer eyepiece mount with eyepiece (AST0800.5) Micrometer eyepiece mount cap (AST0800.6) Micrometer eyepiece filter? (AST0800.7) Micrometer eyepiece mount with eyepiece (AST0800.8) Micrometer eyepiece mount cap (AST0800.9) Micrometer eyepiece (AST0800.10) Micrometer eyepiece (AST0800.11) Micrometer eyepiece (AST0800.12) Micrometer eyepiece (AST0800.13) Micrometer filter eyepiece? (AST0800.14) Micrometer filter eyepiece? (AST0800.15) Micrometer eyepiece (AST0800.16) Micrometer eyepiece (AST0800.17) Micrometer eyepiece (AST0800.18) Micrometer eyepiece (AST0800.19) Micrometer eyepiece (AST0800.20) Micrometer eyepiece part (AST0800.21) Micrometer lens (AST0800.22) Micrometer lens (AST0800.23) Micrometer adjustment key (AST0800.24) Micrometer box (AST0800.25) Information/instructions note (AST0800.26)