British Domestic Synchronous Clocks 1930-1980: The Rise and by Leslie Philip Pook

By Leslie Philip Pook

This e-book enhances on hand one-make books on household synchronous clocks. it's also a heritage of technological know-how publication that units British family synchronous clocks, their brands and expertise of their social context.

Part I covers the historic historical past, British household synchronous clock brands and types, how synchronous clocks paintings, household synchronous clock situations, functional recommendation at the servicing of household synchronous clocks and research of the promoting and reliability of British family synchronous clocks. This research offers a proof of the increase and eventual fall in their know-how. half II includes galleries of a range of British family synchronous clocks and of the routine with which they're outfitted. there's a back and front view of every clock, including a short description. perspectives of every stream contain perspectives with the stream in part dismantled, including a quick technical description of the movement.

This profusely illustrated ebook is essentially for fellow lovers and is predicated on an in depth archive of knowledge on family synchronous clocks, their events and their brands. present electric rules suggest that pro clockmakers are reluctant to fix synchronous clocks. actually, only if they've got now not been mistreated, synchronous clocks tend to be trustworthy, and relatively effortless to keep up.

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

Sample text

1). The laminated U-form stator (Fig. 2b) is made from a magnetically soft material. It is an electromagnetic with a coil at its apex, and it is laminated to reduce unwanted eddy currents. The poles on the left hand side and right hand side of stator are of opposite polarity. The rotor (Fig. 2a, c) is also made from a magnetically soft material. It has 30 poles and rotates at 200 rpm. The stator has a smaller number of poles, but the angular spacing is the same. The voltage of an AC supply varies sinusoidally with time about zero as shown in Fig.

They also supplied synchronous clock movements to other manufacturers. 19 Synchronome Co Ltd Synchronome Co Ltd had its origin in 1895 when Synchronome of London was established by Frank Hope-Jones (Miles 2011; Grace’s Guide 2014). After a turbulent history it was incorporated as the Synchronome Co Ltd in February 1912 with Frank Hope-Jones as one of the directors. Further turbulence followed the end of the Second World Was in 1945 and in 1969 Synchronome was merged with the long established safe maker John Tann to form Tann-Synchronome.

2 Synchronous Motors 35 of cobalt steel as a hard magnetic material. Some later clocks used ferrite. A ferrite is a ceramic made from iron oxides such as haematite (Fe2 O3 ) or magnetite (Fe3 O4 ) as well as oxides of other metals. Ferrites are, like most other ceramics, hard and brittle. For magnetic applications ferrites have the advantage of being non conducting so there are no eddy currents. Discussion of synchronous motors used in synchronous clocks in this chapter is intended to assist understanding, and is largely qualitative.

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