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Field monitor for bacteriological testing
520
CURRENT TOPICS
permits it to be combined with available regulating systems of the static type, to make possible a co-ordinated over-all static system. Among the factors that contribute to failure of conventional switching devices are wear, fatigue, and other effects of environmental conditions. The effects of these factors will be greatly reduced, if not entirely eliminated, because the General Electric static switching devices are encapsulated, have no moving parts, and employ conservatively rated subcomponents, the engineers said. In order to assure maximum reliability and greater freedom from malfunction, fail safe circuitry is provided. In addition, on return of power after any power removal, General Electric static switching control enables the circuit to resume operation at the same point in the cycle where it left off. For easier panel design, construction and maintenance, the new system includes plug-in construction, packaged power supplies, built-in wire trough, and color coding. Trouble shooting can be performed with a standard volt-ohm meter. Monitor lights are also provided for quick checks of proper circuit functioning. Static switching systems are useful where frequent or continuous operations are needed, or where complex systems or adverse environmental conditions exist. The new system is a big step forward in the advancement of automation control, the engineers said.
Field Monitor for Bacteriological Testing.--The new Field Monitor, manufactured by MiUipore Filter Corp., Watertown, Mass., makes it possible to filter water samples at the source for bacteriological testing. Water is drawn up through a tube into
[J. F. I.
the Field Monitor, by means of a syringe which may be readily attached to the top of the Monitor. This process reduces bacterial cells to the surface of the filter contained within the Monitor. Next, the tube is detached, the Monitor and syringe inverted, and special incubation media from an ampoule introduced at the upper side. A slow pull on the syringe diffuses the media for cell nourishment. Then, the syringe may be removed and caps applied to the Monitor openings so that is is ready either for packaging and shipping to a central laboratory or for insertion in a portable incubator. Made of tough Tenite butyrate plastic, supplied by Eastman Chemical Products, Inc., the Field Monitor is practically unbreakable and light and easy to handle. The manufacturer makes it available in a single or double Field Monitoring Kit which includes, also, the necessary filters, sampling tubes, and ampoules of bacterial growth media. All components come pre-sterilized. Surface D a m a g e on Abraded Solids. --Surface and structural defects in solids, with their large influences on mechanical behavior, often have defied detection by previously available techniques. However, in work with semiconductors, such defects can in m a n y cases be readily identified through their electrical influences. One of the more recent examples comes from the electrical studies of the surface perfection of germanium carried out by T. M. Buck and F. S. M c K i m at Bell Telephone Laboratories, Murray Hill, N e w Jersey. Cutting, grinding, and polishing produce an often undesirable layer of "disturbed material" on the surface of solids which chemical and physical studies have repeatedly revealed.
CURRENT TOPICS
permits it to be combined with available regulating systems of the static type, to make possible a co-ordinated over-all static system. Among the factors that contribute to failure of conventional switching devices are wear, fatigue, and other effects of environmental conditions. The effects of these factors will be greatly reduced, if not entirely eliminated, because the General Electric static switching devices are encapsulated, have no moving parts, and employ conservatively rated subcomponents, the engineers said. In order to assure maximum reliability and greater freedom from malfunction, fail safe circuitry is provided. In addition, on return of power after any power removal, General Electric static switching control enables the circuit to resume operation at the same point in the cycle where it left off. For easier panel design, construction and maintenance, the new system includes plug-in construction, packaged power supplies, built-in wire trough, and color coding. Trouble shooting can be performed with a standard volt-ohm meter. Monitor lights are also provided for quick checks of proper circuit functioning. Static switching systems are useful where frequent or continuous operations are needed, or where complex systems or adverse environmental conditions exist. The new system is a big step forward in the advancement of automation control, the engineers said.
Field Monitor for Bacteriological Testing.--The new Field Monitor, manufactured by MiUipore Filter Corp., Watertown, Mass., makes it possible to filter water samples at the source for bacteriological testing. Water is drawn up through a tube into
[J. F. I.
the Field Monitor, by means of a syringe which may be readily attached to the top of the Monitor. This process reduces bacterial cells to the surface of the filter contained within the Monitor. Next, the tube is detached, the Monitor and syringe inverted, and special incubation media from an ampoule introduced at the upper side. A slow pull on the syringe diffuses the media for cell nourishment. Then, the syringe may be removed and caps applied to the Monitor openings so that is is ready either for packaging and shipping to a central laboratory or for insertion in a portable incubator. Made of tough Tenite butyrate plastic, supplied by Eastman Chemical Products, Inc., the Field Monitor is practically unbreakable and light and easy to handle. The manufacturer makes it available in a single or double Field Monitoring Kit which includes, also, the necessary filters, sampling tubes, and ampoules of bacterial growth media. All components come pre-sterilized. Surface D a m a g e on Abraded Solids. --Surface and structural defects in solids, with their large influences on mechanical behavior, often have defied detection by previously available techniques. However, in work with semiconductors, such defects can in m a n y cases be readily identified through their electrical influences. One of the more recent examples comes from the electrical studies of the surface perfection of germanium carried out by T. M. Buck and F. S. M c K i m at Bell Telephone Laboratories, Murray Hill, N e w Jersey. Cutting, grinding, and polishing produce an often undesirable layer of "disturbed material" on the surface of solids which chemical and physical studies have repeatedly revealed.