Properly to arrange a musical box to work in connection with a striking clock to play one tune at each hour, a warning and letting-olf mechanism, similar to that in the train of a striking clock, must be added to the musical-box train. But possibly a quick rebounding blow upon the starting lever is sufficient to start the tune. If so, the clock could be arranged to lift a spring hammer as each hour approached, and to let it fall at the hour, thus striking the musical-box starting lever. The hammer should be arranged so as to be just free of the starting lever when at rest. Its suring allows it to hit the lever in falline.