Sight tube?

Sight tube found in the same crate as the driving clock. Has a metal bracket attached to it.

ID:	ZBA0757.64
Type:	Sight tube?
Display location:	Not on display
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 35 mm x 458 mm x 50 mm
Parts:	Cooke refractor telescope (Telescope) Driving clock (ZBA0757.1) Base (ZBA0757.2) Telescope tube (ZBA0757.3) telescope, part of (ZBA0757.4) Polar axis (ZBA0757.5) Declination axis (ZBA0757.6) Slow motion handle (ZBA0757.7) Non-contemporary bracket (ZBA0757.8) Non - contemporary bracket (ZBA0757.9) Friction roller (ZBA0757.10) fragment of 'V' bracket (ZBA0757.11) Counterweight (ZBA0757.12) Restraining 'v' piece (ZBA0757.13) Right ascension WNM drive (ZBA0757.14) Declination WNM drive (ZBA0757.15) RA divided circle (ZBA0757.16) RA bracket (ZBA0757.17) Driving circle (ZBA0757.18) Declination slow motion (ZBA0757.19) Slow motion line adjustment (ZBA0757.20) Declination circle (ZBA0757.21) Declination Circle (ZBA0757.22) RA driving circle (ZBA0757.23) Bracket (ZBA0757.24) Telescope tube (ZBA0757.25) Cradle for polar axis (ZBA0757.26) Plate from restoration (ZBA0757.27) Stand (ZBA0757.28) Part, stand (ZBA0757.29) Partial pressure tube. Assy (Technical Drawing for refractor telescope) (ZBA0757.30) Mounting flange (Technical Drawing for refractor telescope) (ZBA0757.31) Body (Technical Drawing for refractor telescope) (ZBA0757.32) Body (Technical Drawing for refractor telescope) (ZBA0757.33) Compression spring (Technical Drawing for refractor telescope) (ZBA0757.34) Plunger (Technical Drawing for refractor telescope) (ZBA0757.35) Retaining ring (Technical Drawing for refractor telescope) (ZBA0757.36) Front plate (Technical Drawing for refractor telescope) (ZBA0757.37) Gasket (Technical Drawing for refractor telescope) (ZBA0757.38) Micro switch mounting (Technical Drawing for refractor telescope) (ZBA0757.39) Pin (Technical Drawing for refractor telescope) (ZBA0757.40) Spring (Technical Drawing for refractor telescope) (ZBA0757.41) Pneumatic connector block (Technical Drawing for refractor telescope) (ZBA0757.42) mounting plate (Technical Drawing for refractor telescope) (ZBA0757.43) handle mounting plate (Technical Drawing for refractor telescope) (ZBA0757.44) film mounting ring (Technical Drawing for refractor telescope) (ZBA0757.45) guild rod ( initial machine) (Technical Drawing for refractor telescope) (ZBA0757.46) Thrust ring (Technical Drawing for refractor telescope) (ZBA0757.47) Retaining pin (Technical Drawing for refractor telescope) (ZBA0757.48) Bayonet mount (Technical Drawing for refractor telescope) (ZBA0757.49) Film applicator for head Assy ( Pneumatic) (Technical Drawing for refractor telescope) (ZBA0757.50) End Plate (Partial Pressure Applicator) (Technical Drawing for refractor telescope) (ZBA0757.51) End Plate - Guide Rod SA (Technical Drawing for refractor telescope) (ZBA0757.52) Tube (Technical Drawing for refractor telescope) (ZBA0757.53) Piston rod (Technical Drawing for refractor telescope) (ZBA0757.54) Cylinder (Technical Drawing for refractor telescope) (ZBA0757.55) bayonet mount (Technical Drawing for refractor telescope) (ZBA0757.56) Pneumatic film applicator GA (Technical Drawing for refractor telescope) (ZBA0757.57) Film applicator, back plate assembly (Pneumatic) (Technical Drawing for refractor telescope) (ZBA0757.58) Pneumatic film applicator GA (Technical Drawing for refractor telescope) (ZBA0757.59) Support stand (ZBA0757.60) Handle (ZBA0757.61) Screws for declination circle (ZBA0757.62) Miscellaneous parts (ZBA0757.63) Sight tube? (ZBA0757.64) Handle (ZBA0757.65) Handle (ZBA0757.66) Rod for adjustable handle ? (ZBA0757.67) Handle (ZBA0757.68) Cover? (ZBA0757.69) Metal strip (ZBA0757.70) Friction roller (ZBA0757.71) Miscellaneous parts (ZBA0757.72) Screws and washers (ZBA0757.73)

Sight tube?

Object details