- Museum number
MINUTE-REPEATING SUBSIDIARY SECONDS POCKET-CHRONOMETER MOVEMENT WITH SPRING DETENT ESCAPEMENT.
Repeating chronometer watch.
Spring detent escapement.
Diameter: 42.30 millimetres (back-plate)
Diameter: 51.30 millimetres (dial)
Thickness: 20.60 millimetres
- Curator's comments
- Comment from Anthony G. Randall and Richard Good, Catalogue of Watches in the British Museum. Vol. VI (1990)
Made by Parkinson, c. 1830
Signature: On the barrel bridge 'PARKINSON London 574'.
Dial and hands: Flat enamel dial held by two rectangular feet and screws through the edge of the dial ring.
Gold hour hand, the minute and seconds hands later replacements.
Dial plate (ring) diam. 51.2mm; front plate diam. 51.2mm; back plate diam. 42.4 mm; frame h. 8.0 mm.
Frame: Full plate construction, the dial plate in the form of a ring held with three screws under the dial, thus leaving room for the repeating and motion work. Remainder of the frame conventional with four pillars and pins, the brass parts gilded, detachable barrel bridge.
Fusee: Keywind fusee fitted with stop-work and Harrison's maintaining power with a steel ratchet wheel.
Going train: Conventional; the brass wheels gilded.
Jewelling: Third, fourth and escapement pivots in jewels, the escapement with endstones. The discharge roller and detent with the usual jewels.
Escapement: Made on Earnshaw's plan but with the detent lodged in a slot in the plate like an Arnold detent. The discharge roller placed between the impulse roller and the balance collet. The impulse roller with a polished radial flat to receive impulse.
Balance: Earnshaw-type bimetallic balance with segment weights, timing screws at the ends of the arms each with a small additional gold screw beside it. Diam. 19.8 mm, h. 2.57 mm.
Balance spring: Blued steel helical spring of 8½ turns, with terminal curves to a steel rectangular collet and a polished steel stud.
Repeating work: Stogden-type half-quarter repeating, operated by rack and pinion when the pendant is depressed.
Great wheel (fusee) 70 teeth
Centre pinion 14 leaves, wheel 80 teeth, no crossings
Third pinion 10 leaves, wheel 75 teeth, 5 arms
Fourth pinion 10 leaves, wheel 70 teeth, 5 arms
Escape pinion 7 leaves, wheel 15 teeth, 3 arms
Beats per hour: 18,000
First wheel 64 teeth
Second wheel 48 teeth, pinion 8
Third wheel 44 teeth, pinion 8
Fourth wheel 40 teeth, pinion 8
Fifth wheel 32 teeth, pinion 8
Final pinion 8 leaves
Provenance: Ilbert Collection, purchased by Ilbert in 1930.
- Not on display
Latest: 4 (2017) gongs - monitor for rust
4 (Oct 1995) Dial chipped at IX
- 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.1740 (Ilbert Collection)
Previous owner/ex-collection number: F4 (Ilbert Ledger)