- Museum number
WATCH MOVEMENT WITH LEVER CHRONOMETER ESCAPEMENT. Chronometer watch.
Lever chronometer escapement.
- Production date
Diameter: 46 millimetres
Thickness: 16.10 millimetres
- Curator's comments
- Comment from Anthony G. Randall and Richard Good, Catalogue of Watches in the British Museum. Vol. VI (1990)
Made by 'Nicolas-Robert Robin' (1775-1812), 1807
Watch With Robin Escapement
Signature: On the back plate 'Robin a Paris An 1807 No. 48'.(1)
Dial and hands: Missing. No provision for a seconds hand.
Dial ring diam. 45.9 mm; front plate diam. 44.9 mm; back plate diam. 44.9 mm; frame h. 4.7 mm.
Frame: Full plate construction, four turned pillars and pins, dial ring held by four screws under the dial whose feet went through holes, and were held by pins on the inside of the front plate. No hinge or case catch. The movement retained in the case by pins and two dog screws. Detachable barrel bridge.
Separate cocks for the third and fourth arbor pivots, at both ends. A rectangular hole near the edge of the front plate near the third wheel now has no function. All the brass parts gilded.
Going barrel: Given additional height by passing through a hole in the back plate. The ratchet and click under the dial on the front plate. Geneva stop-work once fitted on the cover. The mainspring hooked with an eye to the barrel and with a brace.
Going train: Pinions well made and polished, the exceptionally thin leaves having almost no addendum. The wheel teeth conventional but meshed deeper than usual. The brass wheels very thin and polished, without gilding.
Jewelling: The balance staff pivots in pierced jewels with endstones.
Escapement: Robin escapement with all the impulse transmitted from the wheel teeth to a steel pallet on the balance staff. The wheel teeth locked on steel pallets, with a large drop during impulse and a small drop on the return of the balance. The fork on the end of the pallet frame near the entry pallet intersecting a protrusion on the balance staff like a single pinion leaf. Banking for the pallet system is by a steel peg forming the projecting end of a screw set in the pallet frame and passing into a hole in the front plate. The impulse and unlocking pallets appear to be later replacements.
Balance and spring: Plain brass three-armed balance, blued steel flat spiral spring of slightly more than 10 turns with a stud and index on the balance cock. No compensation.
Great wheel (barrel) 70 teeth
Centre pinion 10 leaves, wheel 70 teeth, 4 arms
Third pinion 7 leaves, wheel 56 teeth, 4 arms
Fourth pinion 7 leaves, wheel 56 teeth, 4 arms
Escape pinion 8 leaves, wheel 16 teeth, 4 arms
Beat per hour: 17,980
Only the cannon pinion of conventional leaf form, with 10 leaves, remaining.
Provenance: Ilbert Collection; purchased by Ilbert from Goebel in 1932.
(1) If this is the work of the celebrated Robert Robin, then he did not the in 1799 as stated by Tardy 1971, but in 1809 as stated in Baillie 1951.
- Not on display
Latest: 3 (2017)
4 (Oct 1995) Minute wheel and hour wheel missing. Dial and hands missing.
- 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.1748 (Ilbert Collection)
Previous owner/ex-collection number: M209 (Ilbert Ledger)