- Museum number
MOVEMENT OF A HUNTER-CASED LEVER WATCH WITH CASE-WINDING MECHANISM.
Bar movement; going-barrel.
Club-tooth lever escapement; split bi-metallic balance; balance-spring with overcoil; winds by opening front of case.
Hunter case missing.
- Production date
Diameter: 38.10 millimetres (dial-plate)
Thickness: 8.10 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by LSFC Lebet
Neuchatel and Geneva, Switzerland, c. 1890
A self-winding watch movement with a club tooth lever escapement.
Signature: See under Ebauche marks. 'Patent'(1) on the barrel bridge.
Case: missing but was a hunter, as is necessary for this type of winding.(2)
Dial and Hands: Missing. A subsidiary seconds hand was provided.
Ebauche Marks: "Humbert S.A. CHAUX DE FONDS" overstamped "LSFC LEBET NEUCHATEL" and two numbers 1089 and 32232
Frame: Bar movement. Although the plates and the other frame parts are gilded, the screws have been left bright. There is a polished steel pallet cock.
Barrel and Mainspring: Recessed cover to the going barrel of I. diameter 15.4 mm., height 2.5 mm.
Mainspring: height 2.2 mm., thickness 0.20 mm.
Arbor: diameter 5.0 mm., snailed.
Hooking: A slipping mainspring with a single turn of strong spring which lies against the barrel wall to which the mainspring is hooked.
Train: Gilded brass wheels with five arms except for the steel escape wheel which has four.
Jewelled: From the third onwards, the jewels rubbed in, ruby endstones for the balance.
Escapement: Club tooth lever, straight line layout, short lever, double 'upside down' roller, impulse pin D shaped. An equidistant locking escapement. Pallet stones, covered and convex on both locking and impulse faces. Escape wheel of steel, teeth not chamfered. Pallet staff screwed in.
Number of teeth embraced 3½.
Balance: A split bimetallic balance with brass screws. Balance diameter 15.3 mm., thickness 0.8 mm. Blued-steel flat spiral spring of 21 turns with a terminal curve.
Means of Regulation: Index on the balance cock registering against a divided scale on the combined centre and third wheel bridge, with engraved "Fast Slow"
Train Counts and Beat Rate:
Great wheel (barrel) 80
Centre wheel 80 pinion 10
Third wheel 75 pinion 10
Fourth wheel 70 pinion 10
Escape wheel 15 pinion 7
Beat Rate: 18,000
Motion work: mostly missing since the pin that went through the hollow centre pinion is missing. However the minute wheel survives and has 30 teeth with a pinion of 8.
Winding System: Hand set only with normal sliding pinion. Winding can only be accomplished by opening the case cover. Automatic winding is accomplished.
Dimensions: Movement diameter 38.1 mm., height 9½ mm (estimated)
Provenance: Ilbert collection. Ilbert purchased this from Malcolm Gardner 20/11/1936.
(1) See Patent by A. Cohen (H Ramuz) No 2388 1867, which reads as follows:-
"Winding-mechanism for hunting watches. The act of opening and closing the case winds up the mainspring. By means of a lever arm a secured to the lid at the hinge and a link C, motion is given to a lever E, which has a curved rack F with ratchet teeth at its far end. These teeth engage with a ratchet-wheel G on the arbor of the barrel. When the case is released, it flies open by the action of a spring, and the ratchet teeth slip over one another; but, in closing the case, the curved rack engages with the ratchet-wheel teeth and winds up the mainspring to a certain extent.
Overwinding preventing.- The mainspring is attached to a friction ring or bridle to prevent injury from overwinding.
Hands, setting by special mechanism.- A sliding plate T being withdrawn from the head of the stud O, the stud protrudes beyond the case under the influence of the spring R. By this movement the sliding pinion a1 moves inwards and is put into gear with the wheel r through the levers 1,o; in this condition the hands may be set. When the stud is pushed inwards and the sliding plate closed, the pinion is drawn out of gear with the wheelwork, and the hands are no longer interfered with".
Another patent covering a similar arrangement and taken out by Benjamin Hass Junior in December 2 1873 reads as follows:-
"Winding: By the action of opening the case to see the time, the watch is partially wound up. Two metal blades are united by a pin. The first blade terminates in a hook which is fixed to the hinge of the watch lid; at its other end it actuates the second blade, imparting to it a see-saw motion. To the latter blade a rack is attached, the teeth of which gear with the ratchet wheel on the arbor of the barrel spring.
Setting hands: A shaft passing through the pendant, has a button on its external end and a bevil pinion on its internal end. The pinion gears with a similar wheel which transmits motion to a third wheel in communication with the minute wheelwork. A safety detent lessens the friction produced by the gearing of the wheels."
This patent is of course dated after that taken out by A Cohen.
(2) See Brittens 'Old Clocks & Watches 6th Edition' pp 670/1.
- Not on display
Latest: 3 (2017)
- 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.1036 (Ilbert Collection)
Previous owner/ex-collection number: P112 (Ilbert Ledger)