Bowell worked for the Pearson Fire Alarm company for several years, though continuing to work on electric clock designs. He began promoting his own design of slave clock from 1906, and by 1910-11 was operating as the Silent Electric Clock Company, which was incorporated in 1912.TNA: BT 31/20938/124406. The General Post Office used Bowell's design of master and slave clock system from 1910, installing a Silent Electric 'chronopher' at St Martins-le-Grand for distributing the Greenwich Time Service around the Post Office network. Bowell had abandoned the electrically reset Gravity escapement of the Synchronome system in favour of the electrically maintained pendulum design of Matthäus Hipp, and the Post Office used his basic design of clock, in telephone exchanges and for call-timing purposes, for much of the balance of the twentieth century.
