Design of an array to record air showers of energy up to 1021 eV

This is the authors' abstract. We don't add key points for this paper.

The design of an array to record air showers of energy up to 1021 eV is described. Each recording station uses two scintillator tanks spaced 50 m apart and generates a master pulse if [Formula: see text] particles pass through each tank in coincidence, n can be preset in the range 1 to 10. Pulse heights from each scintillator and the time of arrival of the shower front (to ±50 ns) are recorded on tape. The stations are designed to run for at least one week between servicings. Details are given of the scintillators, the circuitry (operated entirely from storage batteries), and the coincidence techniques.