Each step on the snail has two positions(the half-hour and the hour). When the cam raises the lever, this is the half-hour position. There is a cam on the centershaft that determines the position of the hammer detent lever. The strike gear train is stopped when the strike lever falls to impede the rotation of the warning wheel. It is important for the gathering pallet to be adjusted so that striking stops as soon as the last hammer is released, or this feature will not work. At the moment the strike lever falls into the recess of the gathering pallet, the hammer detent lever rises just as the hammer is released. There is a wealth of information in Figure 3 (click on the images to see the enlargements). There is not much to see from the back of the clock. The principles are the same for other Schatz ship's clocks and similar for Chelsea ship's bell clocks. This page offers tips for repair of a Schatz Royal Mariner ship's bell clock.
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