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Some tower clocks in Europe repeat the last hour when
striking each quarter. The mechanism of our palace clock is designed
in such a way that the hour bell strikes only at the end of each hour.
The rest of the time the striking train is idle. It is set in motion
by the operation of the chiming train. To this end the quarter count
wheel has in its rim not only four grooves, but also a special projection.
When the tower clock chimes the last quarter, this lug raises for
an instant then lowers the quarter locking lever (red). That movement
is sufficient to dislodge another locking lever (green) from its groove
on the striking count wheel and set the whole train in motion. In
the diagram the successive operations of the clock mechanism are indicated
by numbers. |
