NEW PRODUCTS FOR ANALYSTS Equipment, Apparatus, Instruments, Reagents, Materials Laboratory Autoclave
A new electrically heated 6-gallon autoclave has been introduced by Andrew Technical Service. Designed for laboratory operations which require elevated temperatures in a "/ater-va.por atmosphere, the autoclave may be used - · for experimental work or as .', yorcabie sterilizer, , . The apparatus has a cast aluminum body and cover, *VL>>9£^-4Éf The pressure-temperature ' ', > • gage reads from. 0 to 30 pounds per square inch, showing corresponding temperatures. The safety release valve automatically opens if the pressure exceeds 21 pounds per square inch (approximately 261° F.). The metal-tometal closure eliminates the need for troublesome gaskets. An aluminum wiring canopy protects the control components, and a red pilot light indicates when the equipment is in operation. The apparatus measures 18 inches high and 16 inches in diameter. I t comes ready to operate with an aluminum container, 11.5 inches in diameter and 8.5 inches deep, and a trivet for supporting instruments, tubes, flasks, and other equipment. 1 Gages for Sheet Materials
Two new absorption and back-scatter beta gages for the low-cost determination of the weight per unit area of sheet materials have been developed by Tracerlab, Inc. The absorption beta gage determines weight changes in sheet materials (paper, plastics, rubber, thin metal sheets) by means of a small beam of beta rays. These rays are emitted from a sealed radioactive source and pass through the sheet to be measured. The gage, in effect, weighs a small area of the moving sheet by means of a beam of radiation. If the density of the material is maintained constant, the meter can be calibrated in units of thickness, thus making the gage a sensitive thickness-control instrument. Beta gages are unaffected by the speed of the moving material and do not contact the Circle desired items for further information on items listed in this section
material being measured. They are capable of use with extremely thin materials which cannot be measured by other methods. Tracerlab's back-scatter beta gages offer advantages for many installations because they are mounted on one side of the sheet only. Back-scatter gages use the same console and recording apparatus as absorption types, but operate on a slightly different principle. 2 Triallyl Cyanurate
The American Cyanamid Co. is offering a new monomer, triallyl cyanurate, in pilot plant quantities. The most promising applications of the compound are in the field of plastics and resins. For example, mats prepared by the polymerization of triallyl cyanurate on glass cloth have high flexural strength even at temperatures above 230° C. Since the compound is compatible with many other monomers and with alkyd resins, copolymerizations can readily be carried out. Such polymers and copolymers are recommended in applications requiring superior heat and chemical resistance. 3 X - R a y Diffraction Spectrometer
An improved recording x-ray spectrometer with widerange goniometer is now available from the Research and ,,^^, Control Instruments Division of North American Philips Co. The complete assembly consists S-ttlll--^;:: :Il«-ï*:3fis|:: of three components: a, basic x-ray diffraction unit, a Geiger:l||pj^[ counter goniometer, and an electronic circuit panel with stripchart recorder. The new instrument, used for x-ray powder diffraction work and fluorescence analysis, incorporates an x-ray optical arrangement which gives high resolution. The basic x-ray diffraction unit is designed to operate on 200 to 240 volts, a.c, 50 or 60 cycles, with full-wave rectification and facilities for visual indication of tube operation. The x-ray tube and transformer are water cooled, and the
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system has a Mgh-flow-rate filter, pressure regulator and gage, and automatic solenoid cutoff protection for high and low pressure limits and flow rate. Safety interlocks are pro vided on all doors and removable panels. The generator has a key-operated main switch, separate high-voltage control switch, and automatic sequence relay operating system. The unit has an exposure timer, an operating time totalizer, and power outlets for accessory equipment. The goniometer is designed to scan and analyze x-ray dif fraction spectra of specimen materials by divergent-conver gent beam-focusing geometry. I t provides for accurate meas urement of angles from 180° to —38°, with a useful x-ray diffraction range from 38° to 165°. The goniometer scan ning has a horizontal axis and a synchronous motor driven in either direction at five different speeds. Stop limits and oper ational controls allow single-scan or oscillatory scanning in any part of the range. The Geiger counter has a thin mica window, a high volume sensitivity, high counting rate, and a life expectancy in ex cess of 100 billion counts. The electronic circuit panel in cludes a Brown strip-chart recorder, timer, and clock panel, scaling and rate meter circuits, impulse counting and inter polation system, d.c. Geiger counter power supply, and spe cially designed voltage stabilizer. 4 Camera Support Central Scientific Co. offers a support for the Polaroid Land camera, which makes possible the production of photo micrographs within a matter of a minute or so. Objects seen under the microscope may be photo graphed for the permanent rec ord, and the finished picture ex amined almost immediately after ward. Any make of microscope may be used, since the height of the camera is adjustable and can be positioned as required. First the camera is positioned over the body tube of the micro scope, with the film and paper carriage open and the groundglass plate in position instead of the film. After the camera has been centered and its dis tance set for infinity, the'Jmicroscope is adjusted to focus an image of the object sharply onto the ground-glass screen. Without the setting of the microscope being changed, the viewer is brought into position over the eyepiece. After the lens of the viewer is centered with the aperture of the eye
piece, the glass screen is adjusted upward or downward until the image of the object comes into sharp focus. This adjust ment is fixed with the lock ring of the viewer. The viewer is now the optical equivalent of the camera and will remain such as long as the same camera is used and the position of the viewer is unchanged. Film and paper are loaded into the camera, and the unit is ready for taking photomicro graphs. 5 Motor-Driven Tumbler Andrew Technical Service announces a new portable motordriven tumbler that can accommodate a 1-quart glass jar. The jar is mounted in a cage which is rotated by a gear-head universal motor with rheostat control from 20 to 110 revolutions per minute. The end-over-end action of the jar subjects the contents to a vigorous displacement for efficient agitation and mixing. When the rotation is stopped, the jar can be brought to an upright posi tion by a few turns of a control knob. All support components of the tumbler, other than the horseshoe base, are cadmium plated for corrosion resistance. The jars are of the Ball type, with glass cover clamped tight against a gasket of rubber, Tygon, or neoprene. The cage is adjustable to admit different sizes of glass jars or test cylinders. Special cage designs can be built to customer's specifications. The standard model operates on 115 volts a.c. or d.c. ; price $95, complete with four glass jars. 6 Radiation Monitor A new instrument that detects and records dangerous gamma radiations in an area and sounds an alarm when aver age tolerance limits are exceeded has been announced by General Electric Co. Called an area health monitor, the device provides an instantaneous indication of radiation, total radiation received in any preset period, and a 3-day integrated record of the radiation present in the immediate vicinity of the detector in 15-minute intervals. | I t also con tains a means of telemetering the rate of radiation to re motely located indicating stations. The new monitor is not meant to replace film badges or
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Use this handy return card to save yourself time. I t will bring information of use to chemists and engi neers in laboratory, pilot plant, and production. The items listed in this special section have been selected by the editors of ANALYTI CAL CHEMISTRY f o r their value and timeliness in helping you to keep abreast of the latest developments in the field.
