ClipArt ETC
An illustration of Hope Jone's dial-driving device. "Each time that a current is sent by the master clock, the electromagnet B attracts the pivoted armature C, and then the current ceases the lever D with the projecting arm E is driven back to its old position by the spring F, thus driving the wheel A forward one division. G is a back stop click, and H, I fixed stops." —Britannica, 1910

Dial Driving Device

An illustration of Hope Jone's dial-driving device. "Each time that a current is sent by the master…