half-hunter watch
- Museum number
- 1958,1201.1019
- Description
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MOVEMENT AND DIAL OF A HALF-HUNTER LEVER WATCH.
.
3/4-plate; fusee; Harrison's maintaining power.
Club-tooth lever escapement; free sprung helical balance spring.
White enamel dial; hours I-XII; sunk subsidiary seconds.
Blued steel hands; double-swell spade hour hand, minute hand missing.
Half-hunter case missing.
- Production date
- 1885-1895
- Dimensions
-
Diameter: 38.70 millimetres (back-plate)
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Diameter: 44.40 millimetres (dial)
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Thickness: 10.50 millimetres
- $Inscriptions
-
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- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Hunt & Roskell
Switzerland, c. 1890
A movement with a club tooth lever escapement.
Signature: On the dial 'HUNT & ROSKELL LONDON' and on the back plate 'Hunt & Roskell 156 New Bond Street LONDON N 11177'.
Case: Missing.
Dial and Hands: Flat dial with sunk subsidiary seconds dial now loose. Blued-steel spade hour hand for half hunter display, minute hand missing. Blued-steel seconds hand. In the enamel on the back of the dial 77. The dial was badly damaged when the movement was ripped from its case.
Movement:
Ebauche Marks: Scratched on the front plate 11177.
Frame: 3/4 plate, the back plate secured by three screws (one missing). Balance cock engraved with scrolling foliage. Plates also badly damaged when the movement was ripped from its case.
Reverse Fusee, Barrel and Mainspring: No. of turns on the reversed fusee 4, a steel maintaining ratchet wheel. Continental stop work, Geneva type with 5 turns.
Flanged Barrel I. diameter 15.2 mm., height 3.1 mm.
Mainspring: height 2.90 mm., thickness 0.21 mm.
Arbor: diameter 4.9 mm., snailed
Hooking: round.
Train: The wheels gilded, centre, third and fourth with five crossings, escape wheel with 4. Highest quality gear train with even the pinion undercuts polished, except for that in the escape pinion.
Jewelled: From the third onwards, all in screwed settings except for the jewel hole for the third and fourth in the front plate. Ruby endstones throughout the escapement.
Escapement: Club tooth lever but the pallets of the English form with covered jewels. Single roller with D shaped impulse jewel.
Balance: A split bimetallic balance with some gold and some platinum screws, platinum quarter screws. A stepped arm to accommodate the spring. Balance diameter 11.2 mm., thickness 1.35 mm. The helical spring of blued-steel has 10 turns and terminal curves.
Means of Regulation: Free sprung, so the quarter screws used for regulation.
Train Counts and Beat Rate:
Great wheel (fusee) 76
Centre wheel 80 pinion 10
Third wheel 75 pinion 10
Fourth wheel 70 pinion 10
Escape wheel 15 pinion 7 (the wheel recessed, the teeth chamfered from both sides)
Beat Rate: 18,000
Motion work cannon pinion 12, minute wheel 36
minute pinion 10, hour wheel 40.
Winding System: Keywound.
Dimensions: Movement diameter 43.2 mm., height 10.8 mm.
Provenance: Formerly in the Ilbert Collection, Ilbert purchased this from Malcolm Gardner 21/8/1932.
- Location
- Not on display
- Condition
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Latest: 3 (2017)
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3 (1994)
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Dial badly damaged between II and IIII.
- 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
- 1958,1201.1019
- Additional IDs
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Previous owner/ex-collection number: CAI.1019 (Ilbert Collection)
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Previous owner/ex-collection number: M29 (Ilbert Ledger)
