> ..it seems it will require human intervention. The article [1] linked to by nl describes it quite well. There are three separate energy reserves in the cloc

> ..it seems it will require human intervention. The article [1] linked to by nl describes it quite well. There are three separate energy reserves in the clock. The hands (dials) mechanism requires human winding -- but only to indicate time, which is kept independently. The chime mechanism is to be primarily ran on human winding. The main (timekeeping) mechanism extracts energy from thermal differences between day and night, and may also be wound by humans. Moreover, if the main mechanism's reserve accumulates enough energy, it is engineered to overflow and wind up the chime mechanism -- thus the chime will ring once in a while even without humans to wind it. Quite cute, if you ask me. Another cunning contraption uses Sun's thermal energy for adjusting the clock to solar time (apparent time). ---- [1] http://www.kk.org/thetechnium/archives/2011/06/the_clock_in_th.php http://www.kk.org/thetechnium/archives/2011/06/the_clock_in_...