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 product.

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.

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AHS winter 1979b.jpg (48230 bytes) Ditisheim marine chrono.jpg (171526 bytes)

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