- Museum number
SILVER CASED LEVER WATCH WITH CENTRE-SECONDS.
Massey type-4, Pouzait, pirouette lever escapement. Cream enamel dial.
Silver case; HM Chester 1836-1837.
- Production date
- 1836-1837 (case)
Diameter: 55 millimetres (case)
Diameter: 48.10 millimetres (dial)
Thickness: 20 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Richard Dean
Leigh, Kent, 1837
Silver cased centre-seconds pirouette watch with Massey type-4 lever escapement and a Massey type 3 roller.
Signature: signed on the back plate 'Richd Dean Leigh No 201'
Case: A silver consular case with the Chester hallmarks for 1837 and the casemaker's mark JP.(1) The fixed dome with decorative turning around the winding and setting key holes and engraved 'Set Hands' around the setting hole. The bow punched with a lion passant. The case scratched with various repair marks.
Dial & hands: Flat dial with a subsidiary hour and minute dial above the centre. The seconds are marked around the outside with each 5th second numbered. Spade pattern blued-steel hour and minute hands. Very delicate blued-steel centre-seconds hand with a broken counterpoise.
Dust-cap: none intended.
Ebauche Marks: None
Frame: A full plate layout, the back plate supported by four turned pillars and retained by screws. The large balance cock is engraved with flowers and foliage and inscribed 'PATENT' in a scroll on the foot and stamped IB.A on the underside. A blued- steel balance protection post is fitted to the front plate.
There is a deep slot in the edge of the front plate an unused threaded hole and a smaller hole which was plugged before the plate was gilded. This slot and the two holes were apparently intended for the case catch and spring but were never used, the catch and spring being positioned in their present locations before the watch was completed.
Fusee, Barrel and Mainspring:
Fusee: five-turn fusee with Harrison's maintaining power, the maintaining ratchet wheel of steel.
Barrel: flanged, internal diameter 18.0 mm, height 3.2 mm. Mainspring: height 3.2 mm, thickness 0.23 mm.
Barrel Arbor: diameter 5.8 mm, not snailed.
Hooking: originally square but now round.
Train: An offset second wheel, the fourth wheel being at the centre. The wheels, apart from the escape wheel, are not gilded. All the wheels have five crossings, and all except the centre wheel are mounted on collets.
Jewelling: Jewelled bearings for the balance pivots only. There is no potency, the dial-side jewels being fitted into the front plate. A ruby endstone in the front plate and a diamond in the balance cock.
Escapement: A Massey type-4l lever escapement, the gilded escape wheel with wide upright teeth of triangular section. The escape wheel arbor is greatly reduced in diameter to provide clearance for the third wheel. The pallets are steel with a triple notch brass arm. A Massey type 3 roller. The enclosed pallet stones are longer than normal and are curved along their length but flat on their acting surfaces. There is no draw (as on all Massey type 4's). (see cat. no. 80 (registration no. 1958,1201.1124) for a similar escapement).
An equal impulse escapement.
No of teeth embraced 3.5.
Balance & Spring: A rounded-rim, polished steel, three-arm balance, diameter 28.8 mm, thickness 0.75 mm. An oversprung flat spiral blued-steel spring with 13 3/4 turns attached to a polished steel stud screwed to the back plate.
Means of Regulation: An index on the balance cock registers against a divided scale with 'S' and 'F' engraved on the balance cock table.
Train Counts and Beat Rate:
Great wheel 60 (fusee)
Centre wheel 64 pinion 10
Third wheel 60 pinion 8
Fourth wheel 40 pinion 8
Escape wheel 15 pinion 20
Beat Rate: 3,600 (seconds beating)
Motion work: cannon pinion 12, minute wheel 36
minute pinion 10, hour wheel 40
(The centre pinion is hollow, the cannon pinion is integral with the pin that passes through the pinion and a detachable square is pinned on to take the key).
Winding System: Key wound.
Case: diameter 54.5 mm, height 20.0 mm, over the glass.
Movement: diameter 48.4 mm, height 13.6 mm, pillar height ? ?? mm.
Provenance: Formerly in the Ilbert collection, purchased by Ilbert from Malcolm Gardner in December 1947.
Exhibited: Newcastle-under-Lyme Museum 1977. See Alan Treherne, 'The Massey Family', cat. no. 41.
(1) Possibly the case maker John Pennington of Liverpool, see Priestley, 1994, p.188.
- Not on display
- Latest: 3 (2017)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number
- Additional IDs
Previous owner/ex-collection number: CAI.1197 (Ilbert Collection)
Previous owner/ex-collection number: Q146 (Ilbert Ledger)