- Museum number
CHROME-PLATED CASED JEWELLED CLUB-TOOTH LEVER CENTRE-SECONDS ALARM WRIST-WATCH.
17-jewel movement with club-tooth lever escapement and alarm mechanism. Silver-coloured metal dial with raised baton hour marks.
Stainless-steel hour, minute and centre-seconds hands; hour and minute hands with luminous-painted bars; black-painted serpentine alarm-setting hand with arrow-head pointer.
Separate winding mechanisms for alarm and going trains.
Chrome-plated case with screw-on back.
- Production date
Diameter: 28.60 millimetres (dial)
Diameter: 34.20 millimetres
Length: 40.70 millimetres
Thickness: 11.80 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by VULCAIN
Switzerland, c. 1960
Wrist Watch with alarm and a club tooth lever escapement.
Signature: On the dial 'VULCAIN ALARM'.
Case: A stainless steel case with the back held by a threaded ring. The alarm hammer strikes a post which is riveted into the back. On the back is 'VULCAIN' in the centre with, set out in a circular fashion, 'SOLD THE WORLD OVER SINCE 1858' On the inside of the back is 'VULCAIN WATCH CO SWISS MADE'
Dial & Hands: A brushed silvered dial with rhodium plated batons at the hours, a double one at the 12 o'clock position. Luminous dots at the outer end of the baton. Skeleton baton hands filled luminous, these and the centre seconds hand also rhodium plated. The alarm hand is serpentine in nature and is of blued steel.
Movement: A nickel silver movement.
Frame: A bridge for the going barrel and keyless work this is engraved SWISS. A bridge for the alarm barrel and one for the train this is engraved '17 SEVENTEEN JEWELS VULCAIN WATCH CO UNADJUSTED', A bridge for the centre wheel and another for the alarm barrel and train. Cocks for the pallets and balance.
Barrels and Mainsprings:
Going Barrel: I diameter 9.2 mm, height 1.5 mm.
Mainspring: height 1.5 mm., thickness 0.11 mm.
Barrel Arbor: diameter 2.95 mm, snailed.
Hooking: Milled from the barrel wall.
Alarm Barrel: I diameter 8.2 mm., height 1.9 mm.
Mainspring: height 1.9 mm., thickness 0.08 mm.
Barrel Arbor: diameter 2.40 mm., snailed.
Hooking: Milled from the barrel wall.
Both barrel covers are recessed.
Train: All the wheels gilded, the centre wheel, third and fourth wheels with five crossings. The steel escape wheel with four.
Jewelling: Jewelled bearings from the third wheel onwards, all the jewels pressed in. Incabloc shock protection to the balance. The alarm train escape wheel pivots are jewelled and the lower pivot of the hammer.
Escapement: A straight line layout club tooth lever escapement with short lever, double roller and D-shaped impulse pin. The exposed pallet stones have flat acting faces. A steel escape wheel with four crossings.
Equidistant locking escapement.
No. of teeth embraced 3½.
Balance & Spring: a monometallic balance with brass screws. Balance diameter 9.7 mm., thickness 0.65 mm. A 'self compensating' flat spiral spring with 12 turns.
Means of Regulation: The index has a divided scale engraved upon it with '+' and '-' and a pointer on the micrometer device registers against it.
Train Counts and Beat Rate:
Great wheel 70 (barrel)
Centre wheel 64 pinion 10
Third wheel 60 pinion 8
Fourth wheel 70 pinion 8
Escape wheel 15 pinion 7
Beat rate 18,000
Motion work: cannon pinion 10
minute wheel 30, minute pinion 8
hour wheel 32
Winding System: There are two buttons, one for the alarm work and one for the going. The going train has conventional stem set positive keyless work but the alarm train has stem set rocking bar keyless work.
Alarm System: A conventional alarm system where the hour wheel can rise when three nibs on it coincide with three slots in the alarm wheel. In rising the hour wheel frees the alarm train via a lever.
Great wheel (Barrel) 78 teeth. Alarm wheel 14 pinion 7
Case: diameter 34.0 mm., height 11.3 mm.
Movement: diameter 26.0 mm., height 8.4 mm.
Provenance: Purchased in 1989 with the aid of funds from the Dingwall Bequest.
- Not on display
- Latest: 2 (2017)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number