valuable time-savers!

TAYLOR COMPARATORS

let you make ACCURATE p H , C H L O R I N E

TESTS

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NEW PRODUCTS

Here's a really fast—and easy—way to make accurate colorimetric tests for pH, chlorine, phosphates, ni­trates, etc. Lightweight, portable Taylor Comparators give you de­pendable, on-the-spot operational data in minutes . . . not hours! Help you control crystallization, bleaching, precipitation, extraction or waste treatment faster. Tests are made simply by placing the treated sample in the middle tube and mov­ing the color standard slide across until the sample matchea one of the standards. Values are then read di­rectly from the slide.

Many Taylor Comparators serve for several determinations with only a change of color standard slides.

COLOR STANDARDS GUARANTEED

All Taylor liquid color standards carry an unlimited guarantee against fading. Be sure to use only Taylor reagents and accessories with Tay­lor Comparators to assure accurate results. SEE YOUR DEALER for Taylor sets or im­mediate replacement of supplies. Wr i t e direct for FREE HANDBOOK, "Mode rn pH

and Chlorine Contro l" . Gives theory and appl icat ion o f p H control. Illustrates and des­cribes complete Taylor line.

with ;i minimum of decay corret "i, tor short-lived isotopes, rapid deter­minations of radioisotopic mixtures, isotope purity and identification studies, and physical measurements of interac­tions, absorption, and scattering.

A complete spectrum is made by precisely stacking the 20 channels upoi: the previous 20-channel run, allowing-a total of 120 channels to be analyzed. Because this multichannel analyzer is more than an order of magnitude faster than most others, it can produce its 120-channel spectrum faster than more expensive instrumentation, according to the manufacturer. Ρ-Π

Chromatographic Analyzer A newly designed ultraviolet chro­

matographic analyzer enables petro­leum analysts to determine aromatic, olefinic, and saturated hydrocarbons by the ASTM D-2 fluorescent indicator adsorption method with greater speed and convenience than afforded by con­ventional F-I-A apparatus, according to the manufacturer—Jarrell-Ash Co., X· •..•!.•- Γ • Λ1 ss.

PYREX® Needle Valve Ware

HEAVY DUTY STEMS Here's a new line of needle valve ware with stems twice as heavy.

Circle No. 92 A-1 on Readers' Service Card, page 101 A

9 2 A · ANALYTICAL CHEMISTRY

This new design means greater strength and longer life in your ware.

NEW LARGE 4.7MM VALVE

Now available as well as the customary 2mm.

PYREX Needle Valve Ware gives you these other advantages, too. Ground flanges. ALL PYREX flange faces are finely ground to assure a better seal, particularly under pressure. Non-contaminating. You get the chem­ical stability of chemical glass No. 7740 in this new ware. Valve body and re­tainer rings are pure TEFLON*. Complete Line. This new PYREX line includes the valves, ground joint connec­tions, burettes, distilling heads, funnels, chromatographic tubes and stopcocks.

Check your PYREX Laboratory Glass­ware Catalog, LG-1, for sizes and prices. *T.M. for Du Pont Tetrafluoroethylene Resin.

CORNING GLASS WORKS 69-10 Crystal Street, Corning, Ν. Υ .

Circle No. 92 A-2 on Readers' Service Card, page 101 A

W. A. TAYLOR AND CO 7306 YORK RD. · BALTIMORE-4, MD.

Corning means reserach in Glass

NEW