Issues

PHERMEX, a Pulsed High‐Energy Radiographic Machine Emitting X Rays, designed and built by members of the staff of the Los Alamos Scientific Laboratory, is a high‐current standing‐wave linear accelerator which generates intense bursts of x rays for flash radiographic studies of explosive‐driven metal systems. A brief discussion is presented of the need for this device and of some of its design features, operational parameters, and radiation output. Several radiographs are shown which illustrate typical applications to studies of fluid flow. A detailed report (“A Pulsed High‐Energy Machine Emitting X Rays” by T. J. Boyd, B. T. Rogers, F. R. Tesche, and D. Venable) is to be published elsewhere.

In response to suggestions that the following “Socratic dialogue” be printed, it is herewith made available to those who were not privileged to hear Professor Rényi's original presentation in August 1963, when he was the after‐dinner speaker at a joint meeting of the American Physical Society and the Canadian Association of Physicists in Edmonton, Alta.

A Report on the Seventh Symposium