Compagnie Des Montres Longines, Francillon S.a.

Michel Thomi

Michel Groothuis

Serge Meylan

Raymond Studer

A watch mechanism incorporating two barrels each containing a spring. The springs contained in each barrel are positively connected in series to each other via a gear mechanism or a common arbor. The considerable energy available makes it possible to maintain the movement of a high frequency spring balance oscillator. The barrel rotates rapidly to drive the first pinion of the train of gears with an angular velocity approximately double relative to the normal angular velocities; the torque is approximately half (600 gr.mm) that of conventional-sized watch mechanism of comparable performance. The barrels may be mounted coaxially or in the same plane and the mechanism can be arranged to be wound manually or automatically.

Watch mechanism incorporating two barrels

Analog display calendar watch having a window or windows and an hour spindle changing device in which the movements of the hour hand and the disc or discs of the calendar are synchronized. The calendar disc is driven once every 24 hours by a rocker lever which supports a plate having a catch engaging the calendar disc, the plate being rotated by a 24-hour wheel and effecting a whole number, greater than one, of turns in 24 hours. The width of the catch is slightly less than the space between two teeth of the calendar disc, so that any forward or backward movement of the hour hand, controlled by the hour setting spindle, permits an immediate forward or backward movement of the calendar disc.

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St.-Imier, Switzerland

Michel Thomi