Abstract
A telescope is described which has been used to determine the directional characteristics of the Čerenkov radiation accompanying extensive cosmic ray air showers. The reflecting telescope has a 12.5-in. aperture, a 48-in. focal length and is of an off-axis design to permit the use of a 19 photomultiplier tube light detection array. Pulse-height information from each tube is fed to separate, spaced inputs on a delay line which supplies the resulting signal for oscilloscope presentation. The various pulse heights provide the Čerenkov radiation directional information. An average of 75% of the Čerenkov photons arrive at the telescope within a half-angle of 2.3°.
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