These pictures were found in Antiquarian Horology,
Winter 1979, page 568.
Notice the striking similarity in the design of Ditisheim's marine chronometer
and that of the Campiche. The dial diameter is 4.84 inches (12.3 cm), compared to the 7
inch diameter plates in the Campiche experimental model. The patent taken
out in 1904 by Campiche is nearly identical in application to both
Campiche's experimental models as well as Ditisheim's final production
It seems a curious design in that the balance wheel is of a massive size.
The large inertia of the balance wheel would be very susceptible to derangement of its'
regular oscillation in the environment of a tossing, turning ship. However, it appears
that this chronometer was not intended for actual navigation, but as a master clock to
drive the slave dials around a large ship, hence the provision for electrical contacts.
The example above is a second-generation test bed for the marine
chronometer, serial number 2. It's height has been significantly reduced to
match that which would fit within a standard box chronometer case. Notice
the dome is the same as in the example illustrated, the later prototype was
placed in the same dome as the first generation prototype which required the
increased height. This example formerly in the William Scolnick collection and now
residing in The Clockworks museum by James Nye, England.