- Museum number
- 1958,1201.1042
- Description
-
MOVEMENT AND DIAL OF A HALF-HUNTER LEVER WATCH WITH INDEPENDENT CENTRE-SECONDS.
.
Bar movement; two going barrels.
Club-tooth lever escapement; split bi-metallic balance; spiral balance-spring with over-coil.
White enamel dial; hours I-XII; sunk subsidiary dial (1/5th seconds).
Blued steel Breguet hands; hour hand with double swell.
Half-hunter case missing.
With the watch a steel winding stem which probably does not belong.
- Production date
- 19thC(mid) (?)
- Dimensions
-
Diameter: 44.30 millimetres (dial)
-
Thickness: 10.70 millimetres
- $Inscriptions
-
-
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Jules Jürgensen
Copenhagen, Denmark, c. 1890.
Watch movement with independent seconds and a club tooth lever escapement.
Signature: On the independant train cock is "Jules Jurgensen" Which?
On the barrel bridge is "Copenhagen No 10137".
Case: Missing, but was hunter.
Dial and Hands: Cannister dial, scratched on the back 10137 and 5. A sunk subsidiary seconds dial numbered 0, 1, 2, 3, 4. Outside the minute circle is a seconds circle marked in seconds in black, with the intermediate 1/5 seconds in red. The seconds numbered 0 in red with 10, 15, 25, 30, 35, 45, 50 and 55 in black. Moon hands with a double moon on the hour hand. Plain subsidiary seconds hand. All hands blued-steel. The centre seconds hand missing.
Movement:
Ebauche Marks: "JULES JURGENSEN COPENHAGEN 10137"
Frame: Of nickel silver with many cocks, bars and bridges on both sides of the front plate. The pallet cock is of steel. The fourth wheel is at the movement centre.
Barrel and Mainspring: Geneva stop work, four turn, the cover recessed. Going barrel I. diameter 16.0 mm., height 2.5 mm. Mainspring height 2.4 mm., thickness 0.17 mm.
Arbor: diameter 5.2 mm., snailed.
Hooking: round, a tongue is provided to keep the outer turn of the mainspring against the barrel wall.
Independent Seconds: Geneva stop work, four turns. to the going barrel. The cover recessed. Barrel I. diameter 14.0 mm., height 2.8 mm.
Mainspring height 2.6 mm., thickness 0.16 mm.
Arbor: diameter 4.40 mm., snailed.
Hooking: round, a tongue is provided to keep the outer turn of the mainspring against the barrel wall.
Trains: Brass wheels gilded and with five crossings except for the steel escape wheel which has four. High quality trains.
Jewelled: Throughout, the jewels bombé, ruby endstones to the escapement, those in the escape wheel and pallet cocks in gold endpieces.
Escapement: Club tooth lever, straight line layout, short lever, single roller, impulse pin D shaped. A light escape wheel of steel with finely chamfered teeth. Pallet frame lightly made with counterpoised tail, the pallet stones exposed, the acting faces flat.
A mixed escapement.
Number of teeth embraced 3½.
Balance: A split bimetallic balance with gold compensation and quarter screws. Balance diameter 15.0 mm., thickness 1.6 mm. Blued-steel flat spiral spring with a terminal curve and with 14 turns.
Means of Regulation: Index on the balance cock registering against a divided scale on the train bridge. The scale numbered from 6-1-1-6 and with engraved "SLOW FAST".
Train Counts and Beat Rate(1):
Going Train
Independent seconds train
Great Wheel 78
Great wheel 78
Second wheel 80 pinion 10
Second wheel 80 pinion 10
3rd wheel 75 pinion 10
Third wheel 75 pinion 10
Centre seconds wheel 60 pinion 10
Fourth wheel 60 pinion 10
5th wheel 64 pinion 8
Escape wheel 15 pinion 6 with mounted on it also a 5 tooth star wheel
A wheel of 30 teeth working with the star wheel (mounted on what?)
Beat Rate: 18,000
Motion Work: cannon wheel 36, minute wheel 36
minute pinion 6, hour wheel 72
Winding System: Conventional positive set keyless work, side set. Each barrel is wound by turning the stem in the appropriate direction.
Independent seconds: Controlled by a side button in the 12 o'clock position. This gives a simple start-stop operation of both seconds hands. The stop work lever interrupts the rotation of the star wheel.
Dimensions: Movement diameter 43.0 mm., height 8.2 mm.
Provenance: Formerly in the Ilbert collection. Ilbert purchased this movement from Malcolm Gardner 13/1/1937.
Note:
(1) Each time the escape wheel revolves (i.e. once in 6 seconds) the star wheel revolves 6 X (5) times.
30
Thus the star wheel revolves once a second (this carries the subsidiary seconds hand so that the dial is marked in 1/5th seconds). Thus the centre seconds wheel revolves once in
60 x 64 secs.
8 8
= 60 secs.
See 'The Jurgensen Dynasty - Three Centuries of Horology in two Countries' by Charles Kalish, La Suisse Horlogere et Revue International de L'Horlogerie No 2, 78th Year pp 45-56 and in issue 3 pp 37-48.
- Location
- Not on display
- Condition
-
Latest: 3 (2017)
-
3 (1994)
- Acquisition date
- 1958
- 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.
- Department
- Britain, Europe and Prehistory
- Registration number
- 1958,1201.1042
- Additional IDs
-
Previous owner/ex-collection number: CAI.1042 (Ilbert Collection)
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Previous owner/ex-collection number: P132 (Ilbert Ledger)