
In the UR-CC1, the minutes are shown by an helix. As the cylinder rotates in its horizontal aperture, the helix progresses as a line along the minutes scale. When the line reaches 60 minutes, the helix winds back quickly to the start of the scale. The hours are similarly shown on a long cylinder, but in 12 lines, each an hour longer than the last against the linear scale of hours. This cylinder jumps to the next line at the end of each hour.
The minutes cylinder is rotated by a rack at the end of a sprung rocker arm that engages the pinion of the cylinder. The rocker arm is lifted and dropped by a rotating vertical cam with three columns shaped like right-angled triangles. A peg on the rocker arm rides up the slope of the triangle, lifting the rack and turning the minutes cylinder. When the peg falls off the top of the triangle after 60 minutes, the rack drops, turning the minutes cylinder in the opposite direction and diminishing the line to zero.
At the same time the hours cylinder jumps forward to the next line.