- Museum number
SKELETONISED WATCH MOVEMENT WITH SPRING DETENT ESCAPEMENT AND HINGED CUVETTE.
typical Lépine construction ; fusee ; Harrison maintaining power.
Pivoted detent escapement; gilt-brass 3-arm balance.
White enamel dial with Arabic hours no seconds indication; signed; winds at 2 o'clock.
Brass inner case and cuvette, signed.
- Production date
Diameter: 49.80 millimetres (base plate)
Diameter: 50.60 millimetres (dial)
Diameter: 51.30 millimetres (movement drum)
Thickness: 7.40 millimetres (movment)
- Curator's comments
- Comment from Anthony G. Randall and Richard Good, Catalogue of Watches in the British Museum. Vol. VI (1990)
Made by Hilaire Bassereau, 1804
Signature: On the dial 'Hilaire Bassereau Palais Royal'. On the cuvette '1/1804 Hilre Bassereau No 316'.
Dial and hands: Slightly curved enamel dial, the edge gilded, the backing blue, secured by two feet and screws in the edge of the movement. Dial signed on the back 'Lucard' (see registration nos 1958,1201.1928, 1958,1201.1153, 1958,1201.1154, 1958,1201.1930). Arabic hour numerals, no seconds.
Blued steel moon hands, set from the front by a square on the cannon pinion.
Movement drum diam. 50 mm inside case; rear flange diam. 51.3 mm; front plate diam. 49.80 mm; frame h. 7.40 mm.
Frame: Typical Lepine construction with his type of balance and barrel cocks. The cocks and barrel cap decorated with engraving. The main plate recessed under the dial. Blued steel screws, brass parts gilded. The movement fitting into a drum and retained by radial screws, and having a cuvette hinged to the drum, these parts also of gilded brass.
Fusee: Keywind fusee, winding through the dial. Harrison's maintaining power with a steel ratchet wheel. Five-turn Geneva-type stop-work, and barrel setting-up-work, lodged on the main plate under the dial. Barrel flanged at both ends, incorporating a brace to assist the hooking of the outer end of the spring. The fusee originally prepared for stop-work operated by the chain at the smaller end, the slot filled.
Going train: Conventional layout and construction, the brass wheels polished and riveted to their pinions.
Jewelling: Only the balance pivots in pierced jewels and with endstones. The working surfaces of the escapement left unjewelled.
Escapement: Pivoted detent escapement. The brass escape wheel mounted on a brass collet on the pinion arbor, and having very short teeth leaning slightly forwards. Steel triangular impulse pallet, its acting surface leaning away from a radial to the tip. The discharge roller a short steel tube adjusted tight on the balance staff, carrying an integral discharge piece lying between itself and the impulse pallet. The steel detent with integral locking surface, carrying a pin set in the nose to bank the passing spring. The passing spring also of steel, carried on the underside of the detent, its foot secured by a single screw. The detent banked against a brass pin set in the plate and returned by a straight spring.
Balance: Plain gilded brass three-armed balance without compensation, the crossings marked with dots on the underside. Diam. 18.6 mm, h. 1.1 mm.
Balance spring: Blued steel spiral spring of just over 9½ turns pinned to a brass collet and stud, and with an index on the cock, the index having a modern Swiss type pin and boot.
Great wheel (fusee) 72 teeth
Centre pinion 10 leaves, wheel 80 teeth, 4 arms
Third pinion 10 leaves, wheel 64 teeth, 4 arms
Fourth pinion 8 leaves, wheel 64 teeth, 4 arms
Escape pinion 7 leaves, wheel 15 teeth, 3 arms
Beats per hour: 17,554285
Cannon pinion 12 leaves, minute pinion 8 leaves
Hour wheel 40 teeth, minute wheel 30 teeth
The minute wheel and pinion are an incorrect replacement; probable counts would be 36 for the wheel and 10 for the pinion.
Provenance: Ilbert Collection; purchased by Ilbert in the Boulevard Raspail in Paris in 1934.
- Not on display
Latest: 3 (2017)
3 (Oct 1995)
- 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.1587 (Ilbert Collection)
Previous owner/ex-collection number: N230 (Ilbert Ledger)