- Museum number
MOVEMENT AND DIAL OF A CENTRE-SECONDS LEVER WATCH WITH STOP-MECHANISM.
3/4-plate, fusee, Harrison's maintaining-power, hollow 2nd-pinion, central 4th-pinion.
Ratchet-tooth lever-escapement, Earnshaw compensation balance, stop lever acts on the roller.
White enamel dial with sunk centre; hours I-XII, sunk centre, 1/5 seconds.
Gold spade hands, minute hand broken and missing, blued steel centre-seconds hand.
- Production date
Diameter: 40 millimetres (back-plate)
Diameter: 43.60 millimetres (dial)
Thickness: 9.80 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Parkinson & Frodsham.(1)
London, c. 1880
Movement of a ratchet tooth lever, centre-seconds stop watch.
Signature: On the back plate 'Parkinson and Frodsham Change Alley Cornhill LONDON 35752'. On the dial 'DECIMAL CHRONOGRAPH REGISTERED SEPr. 13. 1875'.
Case: Missing. The movement was held in the case by two locating pins and a dog screw.
Dial & hands: Flat dial with a sunk centre. A seconds circle, surrounding the minute circle, is divided into 1/5 seconds and numbered at every 25 1/5ths of a second up to 300. Gold spade hands, the minute broken and missing. Blued-steel centre-seconds hand.
Dial-plate: None intended.
Dust-cap: None intended.
Ebauche Marks: 14 0 JP(2) JL(3) 35752
Frame: 3/4 plate layout, the fourth wheel at the centre of the movement. The back plate is supported by three turned pillars and secured by screws and is stamped '752' on the inside. The front plate has a deep recess for the barrel. The combined pallet and escape wheel cock and the balance cock are both numbered '2' on the underside. The balance cock is engraved with foliate scrolls.
Fusee, Barrel and Mainspring:
Fusee: four-turn fusee with Harrison's maintaining power with a steel maintaining ratchet wheel.
Barrel: internal diameter 15.0 mm, height 3.0 mm.
Mainspring: height 2.8 mm, thickness 0.21 mm.
Barrel Arbor: diameter 5.0 mm, not snailed.
Train: Polished brass wheels, the second, third and fourth wheels with five crossings.
Jewelling: Jewelled bearings from the third wheel onwards. The balance jewels with ruby endstones, these and the third and fourth jewels in the back plate are in screwed settings, the rest are rubbed in.
Escapement: An acute-angle layout ratchet tooth lever escapement with short lever, single roller and D-shaped impulse pin. The pallets are not original. The polished brass escape wheel has three crossings.
An equal impulse escapement.
No of teeth embraced 32.
Balance & Spring: A split bimetallic balance with gold compensation and quarter screws. Balance diameter 17.0 mm, thickness 1.3 mm. Blued-steel flat spiral spring with 132 turns pinned to a polished steel stud screwed to the balance cock.
Means of Regulation: An index on the balance cock registers against a divided scale with 'S' and 'F' engraved on the balance cock.
Train Counts and Beat Rate:
Great Wheel 75 (fusee)
Second 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 wheel 36 Intermediate 36
Minute wheel 36, minute pinion 6, hour wheel 72.
The second wheel arbor has a hollow centre to accommodate a friction-tight pin which carries the intermediate motion-work wheel at the front and is squared at the back for hand setting.
Movement: diameter 43.6 mm, height 10.0 mm, pillar height 2.8 mm.
Winding System: Key wound.
Provenance: Formerly in the Ilbert Collection. Ilbert purchased this in the Caledonian Market 4/11/1932.
(1) Because the number of this watch does not fit with the Parkinson and Frodsham series and is not of the quality expected from them it is very likely that this watch is a contemporary forgery.
(2) JP is the mark of the movement ebauche makers Joseph Preston & Sons of Prescot.
(3) JL is the mark of John Lea of Prescot. It is not known what the relationship was between this ebauche maker and Preston.
- 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.1080 (Ilbert Collection)
Previous owner/ex-collection number: M306 (Ilbert Ledger)