Bulle electric clock, c 1920.
© Science Museum / Science & Society Picture Library
This electrically-driven clock was invented by Marcel Moulin (1881-1914) and Maurice Favre-Bulle (1870-1954) of France, and marketed in Britain by British Horo-Electric Ltd, London. The Bulle electric clock was basically an improved version of the clock invented in 1843 by the Scottish electric timekeeping pioneer, Alexander Bain (1810-1877). This invention was an electric clock with an electro-magnetic pendulum which employed an electric current instead of springs or weights to keep it moving. The Bulle Company stated that their clocks would run for 800 days on a single battery, and marketed their own batteries to go with the clocks.