First: The first mechanical circuit-breaker used with an induction coil (M. Masson)
Second: The first automatic or self-acting circuit-breaker used with an induction coil (C. Page)
Third: The first circuit-breaker used with an induction coil having a primary and secondary circuit. (C. Page)
Fourth: The first independent automatic circuit-breaker used with an induction coil (C. Page)
Fifth: The first attached automatic circuit-breaker used with an induction coil (J. McGauley)
Sixth: The first adjustable automatic circuit-breaker used with an induction coil (C. Page)
Seventh: The first mercurial circuit-breaker used with an induction coil (C. Page)
Eighth: The first automatic attached circuit-breaker, in which the retractile force of the hammer was adjustable(C. Page).
Ninth: The first spark-arresting circuit-breaker used with an induction coil (C. Page)
Tenth: The first attached circuit-breaker which combined the means of adjusting the retractile force of the hammer and its distance from the magnet. (C. Page)
Eleventh: The first automatic circuit-breaker with an induction coil for remedial purposes (C. Page)
Ruhmkorff patented his first induction coil in 1851. It used long copper windings and could produce a 2 inch spark. In 1859 a Mr. Gassoit published in France, an account of the Edward Samuel Ritchie coils. Then Ruhmkorff had the opportunity to examine a superior induction coil developed by the American inventor Ritchie in 1860. A Professor McCulloh of Columbia College brought a Ritchie Coil to Paris. Ruhmkorff examined it and that led him (understandably) to incorporate some of Ritchie's improvements and to change his induction coil. His improvements included glass insulation, larger coils, a current reverser (Rheotrope) to change the direction of the primary circuit, and he also added a capacitor."With the exception of Fizeau's condenser, the electrostatic coil is an American invention, and the so-called Ruhnikorff coil was commenced and perfected in the United States, Professor Page developing the electrostatic properties, and Edward S. Ritchie, of Boston, consummating the perfection of the instrument, to an extent far exceeding anything known in Europe."
The improvements were all from page, and Ritchie except for two: The Rheotrope was an invention of M. Masson from 1834. The capacitor (condenser) has two different etymologies. It was French physicist, Armand Hippolyte Louis Fizeau recommended using the capacitor. But that development also was not wholly original. In 1853 Jonathan Nash Hearder exhibited an induction coil with a capacitor. Though little information is available, presumably that capacitor resonated the secondary coil producing yet more voltage. Fizeau developed that improvement separately and patented it in 1853. The awarded coil could produce sparks over 12 inches long.
obscure article by Frank Butler, the Chief Assistant to Dr. Lee De Forest wrote an article in 1924 titled Making Wireless History for Radio Broadcast Magazine.
"The apparatus for sending was a Ruhmkorff induction coil with a vibrator on one end. Direct current was used in the coil and the vibrator converted it into alternating current of slow oscillations as compared with those used to-day. The power used then to send six miles would to-day send almost six thousand."