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16 ENGINEERING including shipping case, F.O.B. Kansas City, Mo. Available for loan (free) from USAEC headquarters and field libraries. Cleared for television. Common sources of airborne contamination are illustrated to show that our world is contaminated by a variety of airborne particles. The difficulties of manufacturing precision devices in such a "dirty" world are shown. The tiny sizes of particles which cause problems in deli- cate assembly work and critical industrial processes are illustrated through animated photography. Earlier attempts to clean air for industrial processes by means of clean rooms are shown. The reasons for less than complete success with standard clean rooms are ex- plained through animation, and the theory and basic operating prin- ciples of laminar airflow systems are shown. The variety of laminar airflow devices (various clean rooms and clean benches) now available is shown. Application of such devices to industrial processes, research and development problems, and to the field of medical care and medi- cal research is illustrated. A short recapitulation points out that laminar flow devices make possible the clean work which must con- tinue in spite of the contamination present in the world. ENVIRONMENTAL TESTING AT SANDIA (1964). 28 minutes, color. Produced by the Sandia Corporation for the USAEC. For sale by Calvin Productions, Kansas City, Mo., at $73.07 per print, including shipping case, F.O.B. Kansas City, Mo. Available for loan (free) from USAEC headquarters and field libraries. Cleared for television. Discussing the environments, both natural and induced, which weapon components and systems may experience between manufacture and use, this technical film shows how environmental testing is used to ensure reliability. A series of test sequences enables the audience to see some of the facilities at USAEC's Sandia Laboratory: giant centrifuge, electrodynamic shaker, rocket sled, air gun, climatic chamber, etc.— which are used to produce varying environments. The film will be of interest to military and civilian engineers, as well as scientists and technicians associated with the weapons program. It will also be of interest to general nontechnical audiences of high school level and above. FUNDAMENTALS OF MECHANICAL VIBRATION (1964). 29 minutes, color. Produced by the Sandia Corporation for the USAEC. For sale by Calvin Productions, Kansas City, Mo., at $76.39 per print, including shipping case, F.O.B. Kansas City, Mo. Available for loan (free) from USAEC headquarters and field libraries. Cleared for television. This technical film for engineers and engineering students discusses