Charles Weiss
On August 31, 1886, Charles W. Weiss of Brooklyn, New York, received a patent (U.S. patent №348437) for an Electro Magnetic Adding Machine. Weiss worked for the Kruse Check & Adding Machine Company in New York, which manufactured cash registers, adding machines, and typewriters. Interestingly, Weiss designed multiple other devices while employed by Charles Kruse, and Kruse’s name was attached to some of these patents: sewing machines, electric gas lighters, electric registering apparatus, drinking vessel, atmospheric engine, photographic passenger recorder, and an adding device for check machines.
Besides the patent, we don’t have any information about the single-column adding machine of Weiss. It was one of the first adding devices with electromagnetic operation, after the machine of Charles Pidgin and Francis Leonard from 1883.
The gear wheels are moved by means of an electromagnetic mechanism, powered by batteries. By pressing a key, a particular contact is closed and in this way is formed an electromagnet, which is rotating a lever, connected with the gear-wheels. The angle of rotation of the lever depends on the location of the contacts.
The image featured at the top of this post is ©Unknown author / public domain.