U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 605
heel or disk onthe armature shaft of the dynamo, a dog en-gaging with said notched disk, a chronomet-ric mechanism controlling said dog to cause 10asaid engagement at definite time intervals,and in circuit with said dynamo a coil rotary,vibrating or oscillating in a field of force, and a time train… … Rail.
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
