- Museum number
CENTRE-SECONDS POCKET-CHRONOMETER MOVEMENT WITH ROBIN TYPE LEVER ESCAPEMENT.
Lever chronometer escapement.
- Production date
Diameter: 43.10 millimetres (back-plate)
Diameter: 46.40 millimetres (dial)
Thickness: 10 millimetres
- Curator's comments
- Comment from Anthony G. Randall and Richard Good, Catalogue of Watches in the British Museum. Vol. VI (1990)
Made by E. Drake, c. 1865
Movement with Robin-Type Escapement
Signature: On back plate 'E. Drake Halifax Patent Union Chronometer 3199'.
Dial and hands: Enamel dial with Roman hour numerals and recessed centre, secured by three feet and pins to the front plate. Signed in the upper half 'Chronometer 3199', on the back in the enamel B. (see registration nos 1958,1201.1832; 1958,1201.1829 and 1958,1201.1830).
Gold minute and hour hands, blued steel sweep centre second hand.
Ebauche marks 18 H.F. 3199, and 99 under the balance cock with c embracing an o on the plate under the cock (see registration nos 1958,1201.1830; 1958,1201.1742 and 1958,1201.1829).
Front plate diam. 46.4 mm; front plate th. 3.73 mm; frame h. 8.0 mm; back plate diam. 43.3 mm.
Frame: Similar to registration no. 1958,1201.1830, but the fusee and barrel positions reversed and the train laid out on the opposite side of the centre. The balance cock and escapement also turned round the opposite way. The movement secured in its case without a hinge or catch, but with a single positioning peg and one case screw.
Fusee: Reversed as in registration no. 1958,1201.1830, an unusual stop-piece screwed to the back plate.
Going train: See registration no. 1958,1201.1830.
Jewelling: See registration no. 1958,1201.1830.
Escapement: Similar to registration no. 1958,1201.1830. Patent Union Chronometer.
Balance: Bimetallic two-armed balance with gold screws, and quarter nuts on steel screws set on the inside of the rim. Diam. 18.7 mm, h. 1.8 mm.
Balance spring: Blued steel helical spring of 8 complete turns, with a terminal curve, free sprung to a polished steel stud on the balance cock and a brass collet on the balance staff.
Great wheel (fusee) 75 teeth
Centre pinion 10 leaves, wheel 64 teeth, 5 arms
Third pinion 8 leaves, wheel 60 teeth, 5 arms
Fourth pinion 8 leaves, wheel 56 teeth, 5 arms
Escape pinion 7 leaves, wheel 15 teeth, 3 arms
Beats per hour: 14,400
Cannon pinion 30 teeth, minute wheel 30 teeth, offset driving wheel 30 teeth
Hour wheel 72 teeth, minute pinion 6 leaves
Provenance: Ilbert Collection; purchased by Ilbert from Benson 1935.
- Not on display
Latest: 4 (2017)
4 (Oct 1995) Balance pivot broken.
- Acquisition date
- Acquisition notes
- Following the successful acquisition of the celebrated Ilbert collection of clocks (1958,1006 collection), prints and other related materials made possible by the generous donation of funds by Gilbert Edgar CBE Ilbert's watches were then acquired using funds provided by Gilbert Edgar, public donations and government funds.
- Britain, Europe and Prehistory
- Registration number
- Additional IDs
Previous owner/ex-collection number: CAI.1828 (Ilbert Collection)
Previous owner/ex-collection number: N289 (Ilbert Ledger)