CACTI: an enhanced cache access and cycle time model

In a clock having a synchronous motor and a chime that is struck once evey half hour by a biased hammer assembly that is prevented from striking the chime except when a tab on the hammer falls into a notch on a wheel driven by the minute shaft, a chime shutoff is mounted on the back cover of the clock for movement between a chime "on" and a chime "off" position.