NEW PRODUCTS Personal Radiation Monitor New device, to be carried in the pocket, is about the size of a fountain pen and weighs S1/2 ounces. It gives warning of the presence of a gamma radiation field by emitting a variablepitched tone and flashing a small neon lamp. The pitch of the warning tone and the flashing rate of the lamp increase with radiation intensity, thus indicating whether the user is entering or leaving a dangerous area. Proportional indication of intensity is obtainable over a range from natural background to 200 roentgens per hour. The instrument uses a miniature Geigcr counter as a radiation detector and a tiny hearing aid earphone coupled to a resonant air column as the warning tone source. The electric circuit, with three transistors and five diodes, occupies about half of the case. The other half contains a small mercury battery capable of a month's operation. Oak Ridge Xational Laboratorv. P-15 Vacuum Dry Box New offering is constructed of 14gage stainless steel with special interior reinforcements. It is described as particularly useful in preparing samples for spectrographic analysis, as well as for minute metallurgical preparations that cannot tolerate oxygen contamination. A small working area is provided, and it can be readily evacuated to about 28 in. Hg. The swinging entrance door at the right end closes against an extruded neoprene double contact gasket, and it is sealed by six adjustable tension, quick disconnect latches. A 10 X 14 X 3 / 4 -in. Lucite viewing panel is provided at the top of the box. The box also has a single tube 12-in. fluorescent light fixture, two valve assemblies, and a 110-volt a.c. electric receptacle within the enclosure. Kewaunee Scientific Equipment. P-16
BURRELL
" F o r Scientists
Everywhere"
ADVANCED I N S T R U M E N T A T I O N for GAS CHROMATOGRAPHY New BURRELL KROMO-TOG IONIZATION MODEL K-7
• Ultra-Sensitive, Completely Safe, Ionizing Detector • Analyzes Fixed Gases and Both Organic and Inorganic Compounds • Column Temperature Programming—Either Manual or Automatic
The new Burrell Kromo-Tog Model K-7 is designed for the most accurate chromatographic analysis possible. Its thermionic emission ionization detector has greatly increased sensitivity, speeds analysis and permits use of small diameter columns and smaller samples. It is the only method that will analyze both organic and inorganic compounds as well as fixed or permanent gases. Superior standard equipment includes a gas sampler, c o l u m n temperature indicator, automatic controller for constant or programmed temperature operation, built-in flowmeter, and flash vaporizer. Potentiometer recorder, offered separately, mounts next to Model K-7 on laboratory bench or table top. Request complete data—ask for Bulletin No. 841.
Portable laboratory oven provides adjustable temperatures to 5 0 0 ° F. It has one cubic foot of space, with two shelves. The top and front of the unit are pivoted on a single hinge. The company says low cost is a practical feature. Planchets. P-17
B U R R E L L CORPORATION SCIENTIFIC INSTRUMENTS A N D LABORATORY SUPPLIES
2223 Fifth Avenue, Pittsburgh 19, Pa. Circle No. 23 on Readers' Service Card V O L 3 3 , N O . 2 , FEBRUARY 1 9 6 1
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