- Museum number
NICKEL-PLATED CASED PIN-PALLET LEVER WATCH.
Ingersoll Revally pocket watch.
Three-quarter plate movement with jewelled club-tooth lever escapement and alarm mechanism; alarm bell mounted on back of movement; keyless winding and hand-setting.
Black dial with white Arabic numerals and white subsidiary seconds dial.
Blued steel hands, hour and minute hands pierced to take luminous paint, now mostly missing; brass alarm setting hand.
Very badly rubbed nickel-plated case with snap-on bezel and hinged back; back hinged to allow back to be opened and used as stand; glass missing; winding button missing.
- Production date
Diameter: 54 millimetres
- Curator's comments
Compare with 1983,1012.98
Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Ingersoll Revally
Alarm watch with a club tooth lever escapement.
Germany, c. 1930
Signature: On the dial 'INGERSOLL REVALLY MADE IN GERMANY'
Case: A nickel plated case with a snap on bezel and a hinged back. The case in a very poor state. There are two side buttons one which is pressed in to effect hand setting of the alarm and the other for the hand setting of the hour and minute hands. Looking from the front that on the left controls the setting of the alarm hand. There is only one barrel and this is wound normally from the button, the stem should be held in place by a type of circlip, this is missing as is the button and stem.
The chrome plated bell should be fixed to the movement at the centre by two screws, these are missing and as a result the bell is disassociated from the movement. It has two apertures one for access to the regulator this marked with a divided scale, and 'S F' and the other for the silencing lever for the alarm, this is marked SILENT ALARM. The bell is also marked 'INGERSOLL REVALLY Made in Germany' and '11 jewels'.
Dial & Hands: An enamel dial black with white Arabic numerals and minute circle. A sunk subsidiary seconds dial with its markings in black. The dial has three feet which are held by side screws in the front plate. The minute and hour hands are skeletonised and the seconds hand is of blued steel, the alarm hand, which is at the dial centre, is gilt with a tail.
Ebauche Marks: None
Frame: A ¾ plate layout, with a cock for the pallets and one for the balance. The plates finished gilt.
Barrel and Mainspring: The going barrel has no cover but relies upon the proximity of the front plate to restrain the spring.
Barrel: internal diameter 18.1 mm, height 2.75 mm.
Mainspring: height 3.0 mm, thickness 0.23 mm.
Barrel Arbor: diameter 4.9 mm, not snailed.
Hooking: Pressed in from the barrel wall.
Train: All the wheels gilded, the centre wheel, third and fourth wheels with five crossings. The steel escape wheel with four.
Jewelling: Jewelled bearings for the escapement only, the jewels rubbed in. Ruby endstones to the balance jewels.
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.
An equidistant locking escapement.
No. of teeth embraced 3½.
Balance & Spring: a monometallic balance with brass screws. Balance diameter 15.1 mm, thickness 0.93 mm. A self compensating flat spiral spring with 11 ½ turns.
Means of Regulation: An index on the balance cock registers against a divided scale with 'F S' and 'A R' engraved on the balance cock table.
Train Counts and Beat Rate:
Great wheel 90 (barrel)
Centre wheel 80 pinion 10
Third wheel 60 pinion 10
Fourth wheel 70 pinion 8
Escape wheel 15 pinion 7
Beat rate 18,000
Motion work: cannon pinion 10
minute wheel 30, minute pinion 10
hour wheel 40
The Alarm Work: A stop wheel mounted on the back plate prevents the alarm train from running for more than about half a turn. The barrel ratchet wheel drives the first pinion in the alarm train, which has a steel wheel mounted on it, this assembly is secured by a shoulder screw. The steel wheel in turn drives the pinion of the brass escape wheel which acts with steel pallets whose arbor carries the alarm hammer. The alarm silencer when pushed over intersects the teeth of the steel wheel and prevents the alarm from working.
Winding System: A side set rocking bar for each of the hand setting operations.
Case: diameter 54 mm., height 20.5 mm.
Movement: diameter 44.5 mm., height 15.2 mm.
Provenance: Donated by the Heron Corporation in 1983.
- Not on display
- Latest: 4 (Mar 1995)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number