NEW PRODUCTS
COLE-PARMER
MICROMETER DISPENSERS' Reproducible Volumes from 0.2 ml to 10 ml
Absolute Accuracy to 0.02 ml
Reproducibility of 0.005 ml
Contamination Free.
*Patent Applied For
Liquids come into contact with glass and Teflont only.
AUTOMATIC REPETITIVE DELIVERY. Dispenser w i l l continuously and precisely deliver all reagents in micrometer-set volumes. AVAILABLE IN TWO SIZES: Dispensers can be obtained f o r delivery of volumes up to either 2 m l . or 10 m l . ACCURATE, EASY TO OPERATE. High v i s i b i l i t y micrometer graduations are accurately calibrated and can be quickly set for desired o u t p u t . HIGH REPRODUCIBILITY. Precision machined Teflon piston in accurately formed glass cylinder bore ensures consistency of repetitive output. SELF-PRIMING. Precisely ground glass ball check valves combine s e l f - p r i m i n g action w i t h highly accurate delivery of reagents. VERSATILE OUTLET FITTING. Tapered glass Luer j o i n t on dispenser outlet accepts either t u b i n g or hypodermic needles. TWO STYLES AVAILABLE. Dispenser can be ob tained w i t h either 500 m l . flask or with hand held barrel t h a t can be attached by t u b i n g to any reservoir or container. REAGENTS ARE PROTECTED FROM ATMOSPHERE. Closures are provided w i t h delivery tubes. Flask style dispensers have air vents that can be closed and that accept absorption tubes.
N E W 1 9 6 8 CATALOG Features over 2 5 0 0 instruments for I n d u s t r i a l Research, the Health Sciences, Chemistry, Biology and A g r i c u l t u r e . Free on request. tT.M.
DuPont
COLE-PARMER
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INSTRUMENT and EQUIPMENT CO. 7330 North Clark Street Chicago. III. 60626 (AC 312) 3380420 Circle No. 32 on Readers' Service Card
102 A
· ANALYTICAL CHEMISTRY
Portable X-ray fluorescence analyzer is compact, lightweight, and suited for field or plant use. Model 4000 uses a radioisotope source to irradiate a sample and measures and selects specific fluorescence X-ray emis sions by means of a high-resolution proportional counter in conjunction
with a balanced filter technique. Elaborate sample preparations are unnecessary and, in performance, the system is comparable to conventional X-ray diffractometers. Three versions of the Model 4000 series are avail able. Panametrics Inc., 221 Crescent St., Waltham, Mass. 02154 403
Cosmic Ray Detector
Temperature Indicator
This detector consists of a large, fiat package containing sheets of Lexan plastic. As a cosmic ray plunges into the layers of plastic and comes to rest, it leaves a tiny track of chemically re active material a few atoms in diam eter. The plastic sheets then are etched in a chemical solution, enlarging the cosmic ray tracks and making them visible to the naked eye. From the length and position of each track, it is possible to determine the atomic num ber of the cosmic ray that produced it. The resolution of the detector increases with the heaviness of the cosmic ray nuclei that it encounters. General Elec tric Research and Development Cen ter, Schenectady, Ν. Υ. 12301 404
Model 1400 is a digital direct reading temperature indicator featuring a solid state nonlinear to linear convertor which uses the latest integrated cir cuits, high reliability, discrete com ponents, and an inexpensive thermistor sensor. The instrument has provi sions for three thermistor probes se lectable with a front panel switch. Terminals are provided for a manual hold of the nonblinking display. Instrulab, Inc., 1205 Lamar St., Dayton, Ohio 45404 406
Automation System Model 500 is a complete automation package designed specifically for X-ray diffractometers and spectrometers. It contains an advanced nuclear pulse height analyzer, scaler timer, preampli fiers, and all I / O devices. Reliability is enhanced through the liberal use of integrated circuits. Approximately 95% of the system makes use of these circuits with the remaining 59ό made up of discrete transistors. Unique fea tures include programmable preset time, background subtract, and peak searching. Digital Automation Co., Inc., 68 Highway 31, Princeton, N. J. 08534 405
Nucleotide Analyzer Model 111 utilizes an anion-exchange resin and a six-hour liquid column methodology for separating, identify ing, and quantitating nucleotides, nu cleosides, and the bases. Purine and pyrimidine bases and nucleosides are separated on a 69-cm column of Type 1-N nucleotide resin, using a single eluting buffer. Nucleotides are eluted on a 20-cm column of Type 1-N resin, using a linear buffer gradient. Tem perature of the column is maintained by a circulating wafer bath, capable of two-temperature programming. Fol lowing separation of components, the effluent is routed to a two-channel UV photometer for identification. Spinco Division, Bcckman Instruments, Inc., 1117 California Ave., Palo Alto, Calif. 94304 407
