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ATOMS FOR SPACE AND SNAP erator that transmits weather data to permanent Canadian and U.S. weather stations is now in operation in the Canadian Arctic (see film "Atomic Weatherman"). A more powerful version of this unit, with a potential life of 10 years, is supplying power for an unmanned auto- matic weather station in the Antarctic. Other SNAP devices will be used for sea buoys, navigation beacons, and portable electric-power stations. The film also briefly summarizes some of the planned space efforts of the future which will use nuclear auxiliary power. NUCLEAR POWER FOR SPACE —SNAP 9A (1963). 12 minutes, color. Produced by the Martin Company. For sale by Byron Motion Pictures, at $37.26 per print, including shipping case. This is a semitechnical film for high-school- and college-level audi- ences. After showing the launching of a new satellite, which is being wholly powered by a nuclear generator, animation is used to explain the use of its isotopic generator to create power to run electronic equipment, recording equipment, and transmit data back to earth for analysis. The advantages of nuclear energy are shown over the use of chemical energy and solar energy. The principles of power generation by isotopic decay are explained, showing how thermocouples convert the decaying isotopes' heat directly to electricity. A comparison of the isotopes Plutonium-238 and Curium-242, both used in SNAP isotope power systems, is made. It discusses the design features of the SNAP- 9A which are the result of 7 years of research. Safety tests of the iso- tope capsule, including explosion tests, fire tests, impact tests, and re-entry tests are shown. NUCLEAR REACTORS FOR SPACE (1961). 17 minutes, color. Produced by Atomics International for the USAEC. For sale by Byron Motion Pictures, at $54.05 per print, including shipping case, F.O.B. Washington, D. C. Also available forfree loan from Atomics International, P. O. Box 309, Canoga Park, Calif. 91305. The SNAP program — Systems for Nuclear Auxiliary Power — is an AEC program to develop long-lived auxiliary power from nuclear en- ergy for use in satellites and space vehicles. Compact atomic reactors being developed by Atomics International for use in SNAP systems are shown in this semitechnical film. Safety characteristics of the SNAP reactor during fabrication, testing, transport, installation, launching, and use in space are described. Detailed sequences filmed at Atomics International on fabrication and testing show the simplicity and com- pactness of the reactors. Safety features are described in scenes that illustrate shipping, launch-site activities, and launch of the reactor into space. The burnup and dispersal of the reactor during reentry into the atmosphere are shown in a detailed animation sequence. Many beneficial uses of SNAP in the U. S. national space program are illustrated.