By Leslie Philip Pook

ISBN-10: 3319143875

ISBN-13: 9783319143873

ISBN-10: 3319143883

ISBN-13: 9783319143880

This booklet enhances on hand one-make books on household synchronous clocks. it's also a historical past of technology publication that units British household synchronous clocks, their brands and expertise of their social context.

Part I covers the old history, British family synchronous clock brands and types, how synchronous clocks paintings, household synchronous clock circumstances, functional suggestion at the servicing of family synchronous clocks and research of the selling and reliability of British household synchronous clocks. This research presents an evidence of the increase and eventual fall in their expertise. half II comprises galleries of a variety of British household synchronous clocks and of the activities with which they're equipped. there's a back and front view of every clock, including a short description. perspectives of every circulate contain perspectives with the circulate in part dismantled, including a short technical description of the movement.

This profusely illustrated e-book is essentially for fellow fans and is predicated on an intensive archive of knowledge on household synchronous clocks, their activities and their brands. present electric rules suggest that pro clockmakers are reluctant to fix synchronous clocks. in truth, only if they've got no longer been mistreated, synchronous clocks are typically trustworthy, and really effortless to keep up.

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Extra resources for British Domestic Synchronous Clocks 1930-1980: The Rise and Fall of a Technology

Sample text

2 Synchronous Clock Production In the UK, the manufacture of synchronous clocks, including synchronous alarm clocks became widespread in the 1930s with the availability of mains electricity of standardised and accurately controlled frequency. UK output of synchronous clocks was 5,000 in 1930, 19,000 in 1931 and 183,000 in 1932 (Nye 2014). Corresponding figures for mechanical clocks were 24,000, 36,000 and 636,000. Annual supplies of electric clocks to the UK market, including imported clocks were approximately (Anonymous 1951): 1935: 108,000, 1945: 192,000, 1946: 732,000, 1947: 924,000, 1948: 576,000, 1949: 432,000.

For descriptions of individual synchronous clock movements see Chap. 11. 2 Synchronous Motors An electric motor consists of a rotor which rotates within a stator. It is driven by the magnetic fields associated with the rotor and stator in the same way that the magnetic pointer of a compass aligns itself with the Earth’s magnetic field. Motors can be designed to use either DC (direct current) or AC (alternating current). The time keeping of a synchronous clock depends on a synchronous motor, which is powered by an alternating current (AC) supply of electricity.

UK output of synchronous clocks was 5,000 in 1930, 19,000 in 1931 and 183,000 in 1932 (Nye 2014). Corresponding figures for mechanical clocks were 24,000, 36,000 and 636,000. Annual supplies of electric clocks to the UK market, including imported clocks were approximately (Anonymous 1951): 1935: 108,000, 1945: 192,000, 1946: 732,000, 1947: 924,000, 1948: 576,000, 1949: 432,000. Most of these would have been synchronous electric clocks. In 1935 electric clock production was around 100,000 and in 1937 around 165, 000 (Lines 2012).

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British Domestic Synchronous Clocks 1930-1980: The Rise and Fall of a Technology by Leslie Philip Pook


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