In his Nobel Prize lecture,[1] Bothe described how he had implemented the coincidence method in an experiment on Compton scattering in 1924.
On the film record he could discern coincident discharges with a time resolution of approximately 1 millisecond.
Their paper, entitled Das Wesen der Höhenstrahlung", was published in the Zeitschrift für Physik v.56, p.751 (1929).
Bruno Rossi, at the age of 24, was in his first job as assistant in the Physics Institute of the University of Florence when he read the Bothe-Kohlhörster paper.
He fabricated Geiger tubes according to the published recipe, and he invented the first practical electronic coincident circuit.
It employed several triode vacuum tubes, and could register coincident pulses from any number of counters with a tenfold improvement in time resolution over the mechanical method of Bothe.
Rossi described his invention in a paper entitled "Method of Registering Multiple Simultaneous Impulses of Several Geiger Counters", published in Nature v.125, p.636 (1930).
Rossi used a triple-coincidence version of his circuit with various configurations of Geiger counters in a series of experiments during the period from 1930 to 1943 that laid an essential part of the foundations of cosmic-ray and particle physics.