The US statistician, romance novelist and amateur engineer Charles Felton Pidgin (1844-1923) (see biography of Charles Felton Pidgin) from Boston, Mass., was a holder of quite a few patents (at least 10) for various devices, like indicator, apparatus for compiling statistic, calculating mechanism for typewriter, motion picture (a very funny idea for adding word balloons to movies by having the actors blow into inflatable tubes that had the words on them), and others, between them two patents for calculating machines (US284755 and US735291).
The first patent (US284755 from 1883) was for an electro-magnetic adding machine and was granted to Charles Pidgin and Francis Leonard. It was problaly the first patented electro-magnetic calculating machine. Francis Henry Leonard Jr. (1859-1908) was a Boston salesman and machinist, who also was a holder of several patents.
Charles Pidgin's machine patent drawing