Synclock electric time-piece, 3½-inch dial, by Everett, Edgcumbe and Company Ltd., London, England, 1931.

Record summary

Held and catalogued by Science Museum Group, London (object number 1931-516), this is an electrically-driven subsidiary clock; synchronous motor clock by Everett, Edgcumbe and Company Limited, made in London, England, United Kingdom, London, dated 1931. The Atlas places it in the Golden Age of Mechanical Watchmaking period (1900 – 1945) of its Clocks collection. Recorded dimensions: overall: 200 mm x 165 mm x 75 mm, 1.328 kg. The record is illustrated with 1 photograph.

Assembled from the source record's structured fields. Dates and attributions are given as the source states them; where a field is missing the Atlas leaves it blank rather than estimating.

Catalogue description

The source record does not include a narrative description. The structured fields above are reproduced from it.

Atlas type guide

Electric and synchronous clocks

Alexander Bain patented the electric clock in 1841, and through the later nineteenth century electricity was used both to drive pendulums and to distribute time. Master clocks sent impulses every half-minute or minute to subsidiary ('slave') dials across factories, schools, railway stations and post offices; Matthäus Hipp's toggle (1842) kept pendulums swinging with minimal interference. William Hamilton Shortt's free-pendulum clock (1921), with a slave pendulum doing the mechanical work, became the most accurate mechanical clock ever made in series.

In the 1920s and 1930s synchronous motor clocks, which count the alternating-current cycles of the mains supply (50 or 60 Hz), arrived in homes; Telechron in the United States and Smiths 'Sectric' and Ferranti in Britain made them in great numbers. Battery clocks such as the Bulle, Eureka and ATO used electromagnetic impulsing of balances or pendulums.

General guidance written by the Atlas editors about this kind of object. It is not a statement about this particular piece; for that, rely on the source record above and on physical examination.