William Hamilton Shortt, an engineer on the London & South Western Railway, became interested in precision timekeeping in 1906 and patented his own clock in 1911. The early examples did not reach the standard he had set himself and he continued to work on the project. He had met HJ in 1910 and at some time before 1921 he became a director of the Synchronome Company.
It was manufactured by the Synchronome Company and used a virtually unmodified standard Synchronome clock as the slave clock in the system. It became the standard timepiece for observatories all over the world until superceded, years later, by the precision quartz crystal clock.
A good and fairly simple description of the Shortt-Synchronome can be found in Britten's Watch & Clockmaker's Handbook and Guide 16th edition and rather surprisingly, a more detailed account is given in Eric Bruton's book on the History of Clocks and Watches.