Lever escapement watch by Josiah Emery

Made:
1792 in London
maker:
Josiah Emery
Lever escapement watch by Josiah Emery Lever escapement watch by Josiah Emery Lever escapement watch by Josiah Emery

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Lever escapement watch by Josiah Emery
Science Museum Group / The Clockmakers' Museum
© The Board of Trustees of the Science Museum

Lever escapement watch by Josiah Emery
Science Museum Group / The Clockmakers' Museum
© The Board of Trustees of the Science Museum

Lever escapement watch by Josiah Emery
Science Museum Group / The Clockmakers' Museum
© The Board of Trustees of the Science Museum

Gold straight line lever escapement watch by Josiah Emery, London. Gold case, stamped VW (for casemaker Valentine Walker) and hallmarked 1792 – 3. White enamel dial with blued steel central minute hand and subsidiary dials for hours and seconds. Signed Emery London. Full-plate gilt movement with balance bridge. Straight line lever escapement, without draw. The balance staff has a cranked roller for impulse and unlocking and there is a separate safety roller. Brass balance with timing screws and two S-shaped bi-metallic arms. Helical balance spring. The pallets of the lever embrace five teeth of the escape-wheel. Signed ‘Josiah Emery, Charing Cross, London 1289’. Dust cap, also signed 'Josiah Emery Charing Cross London 1289'.

This watch is one of the first in which Emery used a cranked roller after abandoning his earlier, Mudge-type escapement on two planes

Clockmakers' Museum No. 455.

Details

Category:
Clockmakers
Object Number:
L2015-3366
Materials:
brass (copper, zinc alloy), enamel, glass, gold (metal) and steel (metal)
type:
watch
credit:
Lent by the Worshipful Company of Clockmakers