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34 PHYSICAL RESEARCH pipe, or disk-loaded waveguide, through which the electron beam travels, is manufactured from oxygen-free, high-conductivity copper cylinders and disks. The film shows in detail the steps followed in brazing together of 84 cylinders and 85 disks to form a basic 10-foot section of the accelerating structure. Significant steps shown and de- scribed include: machining of cylinders and disks; annealing of parts; fabrication of input and output coupler sub-assemblies; brazing of a 10-foot section in a unique, hydrogen—oxygen, split-ring burner flame furnace; of tuning and high power of testing of a section using the full power of a klystron tube; and, the mounting of four 10-foot sections and associated components. FUNDAMENTALS OF RADIOACTIVITY (Radioisotopes Series) . . . See page 75 FUSION RESEARCH (A Geneva-1964 film). 22 minutes, color. Produced by USAEC's Argonne National Laboratory. For sale by Byron Motion Pictures, in English, French, Spanish, or Russian, at $61.93 per print, including shipping case, F.O.B. Washington, D. C. English version available for loan (free) from USAEC headquarters and field libraries. Cleared for television. This technical film describes the nature of thermonuclear research as illustrated by many of the current investigations of plasma production and confinement. The major obstacles to success are plasma oscilla- tions and instabilities which result in plasma loss from the magnetic containers. The film gives a qualitative description of some of the instabilities, of energy loss through charge exchange and radiation due to contaminants; and also describes plasma measurements, which are now very sophisticated. Several research devices in the United States on which progress has been encouraging are described in the film. HIGH ENERGY PARTICLE ACCELERATORS (1958). 30 minutes, color. Produced by Audio Productions, New York, for the USAEC. For sale by Byron Motion Pictures, at $114.85 per print, including shipping case, F.O.B. Washington, D. C. Available for loan (free) from USAEC headquarters and field libraries. Cleared for television. This technical film surveys the work of particle accelerators in high- energy physics, shows the major accelerator installations in the U. S., major accelerators under construction, and a series of typical experi- ments with high-energy particles. It explains, with both live action and animation, the components and operations of various types of accelera- tors and gives a description of bubble chambers. The film features information on the following operating accelerators: the Brookhaven National Laboratory Cosmotron (proton-synchrotron), the Uni-