Theodolite extension tube

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Theodolite extension tube.

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ID:	NAV1461.7
Type:	Theodolite extension tube
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Diameter: 40 mm;Overall: 52 mm
Parts:	A-frame telescopic (Theodolite) Theodolite case (NAV1461.1) Theodolite eyepiece (NAV1461.2) Theodolite eyepiece (NAV1461.3) Theodolite eyepiece (NAV1461.4) Theodolite shaded eyepiece (NAV1461.5) Theodolite lens cap (NAV1461.6) Theodolite extension tube (NAV1461.7) Theodolite plumb bob (NAV1461.8) Theodolite screwdriver (NAV1461.9) Theodolite tommy bar (NAV1461.10) Theodolite box key (NAV1461.11)