| 摘要 |
<p>A short-duration signalling device for a clock with hour and minute hand and a signal circuit (11) connected to a voltage source (10) is specified. The time interval between the current clock time and the signal time, which, at most, comprises one hour in this short-duration signalling device, is obtained from the adjustable advancing, seen in the clockwise direction, of the signal hand (31) compared with the minute hand (41). When, due to the progress of the minute hand (41), the latter coincides with the signal hand (31) at the signal time, a signal tone is emitted by the signal circuit (10). <IMAGE></p> |
