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Brillié electrically driven mechanism which runs from a single dry cell (1.5 volts, no more!). The original cell had an electrolyte of silver chloride and is no longer available, a Duracell is used in its place. The pendulum carries a specially shaped magnet and has a heavy spherical metal bob.
The Brillié is one of the few master clocks which have a sweep seconds hand

Interestingly,the French terminology for a "Master" clock is a "Mother" clock and a "Slave dial" is called a "Daughter clock". The French always seem to do things differently but in this politically correct day and age, "daughter clock" may have a better sound than "slave"

The clock shown here is a typical Brillié master clock in a metal case intended for industrial or office use.

Mahogany cased versions can also be found but are less common. One for domestic use (the slave drive contacts are not fitted) is shown here

A four glass version designed just as a clock is especially collectable and attractive.

Brillié clocks are not often found in England (where I live) but were very popular in France, where they developed from a clock invented by Charles Féry in 1908. The Brillié Bros, with Charles Le Roy developed a system based on Féry's clock for the Paris Observatory in 1910. The shape of the magnet was modified to give a more uniform magnetic field, this modification was due to Marius Lavet who later designed the first transistor switched clock for ATO.

The small bars of soft iron near the coil act as regulators. Contacts in the master clock version provide a pulse every 30 seconds but these are of alternating polarity.

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