HJ spent some thirteen years developing his 'sync switch' as he termed it. 
In 1895, HJ who was then working with GBB (1875-1942), formed the Synchronome Company, took out their first patent and started production. The Company was initially based in Birkenhead.
HJ spent some thirteen years developing his 'sync switch' as he termed it.
Second page. These two extracts from an early Synchronome catalogue sets out clearly how this switch worked and gives his views on why his system was the best (and in his view, the only, way forward).
In the first few years the clocks were of differing styles and movements and had no serial numbers.
The first clocks had a recoil or a dead beat escapement. Clear pictures of these early clocks are hard to find and by far the best I have came from Norman Heckenburg and shows a 1904 English built electrically rewound spring driven deadbeat escapement used to control the Town Hall clock in South Brisbane, Australia. see 'The Australian connection'.
Norman is Reader in Physics at the University of Queensland and director of the Physics Museum there. He was a member of the NAWCC Chapter 104 team which produced the booklet 'Synchronome Brisbane 1903-1991' in 1998.
The most radical change was in 1905 when the dead beat escapement was superceded by a gravity escapement. British Patent 6066/1905 describes a gravity arm tripped by a countwheel which impulses the pendulum directly once every thirty seconds. The countwheel was pushed around anticlockwise and it was not until later that the usual syatem of pulling the countwheel clockwise was evolved.
I include a blurred picture of an English movements from this early period, but this shows no detail though the gravity arm can be seen.It should be noted that the movement has a rectangular brass base, not the cast iron A frame of later clocks.
The final patent for his Master Clock design was granted in 1908. By that time the partnership with GBB had been dissolved and the company was based in London.