Diameter: 55.800 mm
M&ME CAI 1645
Room 38-39: Clocks and Watches
Gold cased watch with lever escapement by Josiah Emery
London, England, AD 1786
Thomas Mudge's pioneering work in the
1750s and 1760s created a new type of escapement for portable
timekeepers - the
This particular example is signed 'Josiah Emery, Charing Cross, London 1089' on the movement. The 18 carat gold case is hallmarked 'London 1786' and bears the mark 'VW', Valentine Walker, who was a watch case maker of Clerkenwell, London.
The white enamel dial is of the so-called 'regulator' type. The minutes are marked around the outside and, above the centre, separate subsidiary dials for hours, with seconds below. The movement is characteristic of Josiah Emery's work, with finely gilded plates and a decoratively engraved bridge on the back plate for the balance. The gear train consists of the standard four wheels which drive the lever escapement. This, in turn, is controlled by a temperature compensated balance, known as the 'double S', designed to obviate timekeeping errors caused by temperature change.
J. Betts, 'Josiah Emery, watchmaker of Charing Cross', Antiquarian Horology-2, XXII (1996), pp. 394-401, 510-523
J. Betts, 'Josiah Emery, watchmaker of Charing Cross', Antiquarian Horology-4, XXIII (1996-1997), pp. 26-44, 134-150, 216-230
A.G. Randall (revised by R. Good), Catalogue of watches in the -1 (London, The British Museum Press, 1990)