- Museum number
SILVER CASED VERGE WATCH WITH STOP LEVER.
Movement with fusee, standard stop-work and Harrison's maintaining power.
Gilded four arm balance with eight red-gold timing screws.
Bimetallic 'sugar tongs' compensation, the bimetal with a later red-gold solid end.
Stop lever acts on the balance rim.
White enamel regulator dial, blued steel heart -tip hands. Plain seconds hand with long counterpoise and gold boss.
Silver consular case.
- Production date
- 1784 (case)
Diameter: 39.60 millimetres (back plate)
Diameter: 54.80 millimetres (case)
Diameter: 43.30 millimetres (dial plate)
Diameter: 42.90 millimetres (dial)
Diameter: 41.80 millimetres (front plate)
Height: 24.90 millimetres (case)
Thickness: 9.50 millimetres (movement)
Thickness: 25.20 millimetres
- Curator's comments
- Comment from Anthony G. Randall and Richard Good, Catalogue of Watches in the British Museum. Vol. VI (1990)
Made by Josiah Emery, 1784
Signature: On the back plate: 'Josiah Emery Charing Cross London No 1005'. Repeated on the dust cover. On the dial 'EMERY LONDON' across the centre.
Case: Silver consular case with the London hallmark for 1784 and maker's mark vw.(1) Diam. 54.8 mm, h. over glass 24.9 mm.
Dial and hands : Flat enamel regulator type dial.
Central minute hand with subsidiary seconds below and hours above. Blued steel hands.
Dial plate diam. 43.3 mm; front plate diam. 41.8 mm; back plate diam. 39.6 mm; frame h. 9.5 mm.
Frame: Full plate with four turned pillars, the back plate retained by pins, without a detachable barrel bridge. Separate dial plate attached to the front plate by three short feet and pins carrying the movement hinge. The case catch and spring mounted on the front plate under the dial. An elaborate dust cover retained by a blued steel clip. All the brass parts gilded.
Fusee: Keywind fusee with stop-work and maintaining power, the maintaining ratchet wheel brass, most unusually sunk into the thickness of the great wheel. The great wheel of considerably larger diameter than the bottom of the fusee and passing under the barrel. The setting up by worm and wheel mounted on the inside of the front plate under the barrel.
Going train: With the exception of the escape wheel, all the brass wheels gilded, including the great wheel. The pinions and arbors finished to the highest possible standard. The pivots of the third and fourth arbors on the front plate side carried in a separate bridge. The great wheel with the unusual number of forty-nine teeth.
Jewelling: The lower pivot of the fourth arbor in a pierced jewel with very small oil sink, set in a brass ring retained by screws. The pivots of the balance staff in pierced jewels with endstones.
Escapement: Normal verge escapement, the pivot of the escape pinion on the escape wheel end carried in a steel plate carefully set in the balance potence. As a result of the steel on steel contact the pivot is badly worn.
Balance: Gilded brass four-armed balance with eight gold screws set in the rim. Two pins, not set diametrically opposite in the rim, point inwards and act as stops against an extension to the balance spring stud.
Balance spring: Blued steel short spiral spring of 4¼ open turns, pinned to a gilded brass stud screwed to the end of a massive gilded brass piece overhanging the balance with its foot screwed to the back plate next to the foot of the dust guard round the winding arbor. No regulator.
Thermal compensation: A short bimetallic strip screwed to a gilded brass block, itself screwed to the back plate, carries a gold piece nearly half the total length on the free end. The end of the gold piece is bent down on the inside of the last turn of the balance spring, 90° round from the pinning point. Also carried on the gilded brass block is a brass piece having a long and short arm overhanging the balance. The longer arm has the end shaped to match the gold piece, on the outside of the balance spring. The shorter arm carries an adjusting screw operating on the longer arm.
Balance stop: Operated by a push-piece near the case catch and moving a polished steel stop-stud set in a blued steel arm screwed to the underside of the back plate. The stop operates on the underside of the balance.
Great wheel (fusee) 49 teeth
Centre pinion 12 leaves, wheel 64 teeth, no crossings
Third pinion 8 leaves, wheel 60 teeth, 4 arms
Fourth pinion 8 leaves, wheel 70 teeth, 4 arms
Escape pinion 8 leaves, wheel 17 teeth, 3 arms
Beats per hour: 17,850
Cannon pinion 10 leaves, minute pinion 12 leaves
Hour wheel 36 teeth, minute wheel 40 teeth
Provenance: Ilbert Collection; purchased by Ilbert from Malcolm Gardner in 1941.
(1) The case maker probably Valentine Walker.
- Not on display
- Latest: 2 (2016)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number
- Additional IDs
Previous owner/ex-collection number: CAI.0806 (Ilbert Collection)
Previous owner/ex-collection number: Q83 (Ilbert Ledger)