Λ HARSHAW
Crystal Products CHTSTAl SOCIO ÏMTt DIVISION
Performance tested crystals for use as gamma radiation d e t e c t o r s , IR w i n d o w s a n d UV components.
I M S Enl Silk Si. · C I M U * Otoi 41101 • Firm ZIG J Ï 1 H D 0 Utrechi Netherlands- H a i s r - . a . v - ^ " [>„, H O O T . M >J F:an.lur! W G e r m a n * - H j i s h d w O e r - i . e CjmoH
Infrared Optical Materials
Harshaw infrared materials transmit to 70 m i c r o n s . Available as b l a n k s or polished to your finished specifications.
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HARSHAW
IR Pressed Pellet Powders cm t m totw
Digital Indicator Unit. A 4-page bul letin describes the T e c h t r o n Model D I 20 digital indicator unit which is in tended for use with t h e T e c h t r o n a t o m ic absorption spectrometers. R e a d o u t is in absorbance or concentration units ; a n averaging mode permits 5 or 10 suc cessive readings of the same sample. Aztec I n s t r u m e n t s , Inc., 2 Railroad PL, Westport, Conn. 06880 613
pH Electrodes. A 12-page bulletin (FS-265) features the company's com plete line of p H electrodes. Fisher Sci entific Co., 717 Forbes Ave., P i t t s burgh, P a . 15219 614
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KBr, Csl, a n d T I B r , IR Pressed Pellet P o w d e r s are s u i t a b l e over a wide spectral and refractive index range.
The Harsh aw Chemical Co. IMS EM Hit St · OmtMt Ota 4410S · Ftan îll U1-IJH
Thermogravimetric Analysis. Bulle tin 10-560-100, 12 pages, describes a T G A svstem which can be a d a p t e d for DTA and DTGA. Fisher Scientific Co., 717 Forbes Ave., P i t t s b u r g h , P a . 15219 615
DIVISION
Frankfim. W G e r m a n y - HaiiHav* Chemie G r i b H
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HARSHAW
Silver Chloride cmsiu sotio
This unique IR m a t e r i a l is i n s o l u b l e in water, transmits out t o 22 m i c r o n s , available as w i n d o w s only .016" t h i c k .
The Harshaw Chemical Co. IMÏEMtlMSt.· OmlMIMiUIH.n>i21iniUH
Λ HARSHAW
Performance Tested Crystals ÎHYSTJH itSOLI D *rt
Now, it's rapid 3 electrode polarooraphy
Color Difference Meters. Reflections and Transmissions, N o . 8, 1967, fea tures the Model D 2 4 series of color dif ference meters. H u n t e r Associates L a b o r a t o r y , Inc., 9529 Lee Hwy., F a i r fax, Va. 22030 612
The Harsh aw Chemical Co.
HARSHAW
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MANUFACTURERS' LITERATURE
Crystals for u s e a s X-ray monochrom a t o r s , X-ray detectors, reststrahl plates, a n d refracting components.
The Harshaw Chemical Co. •Hi EM IM SI. • D M W OUI 441M - fta» HI 7211311
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Your inquiries for complete information are invited.
The Harshaw Chemical Co. 1945 East 97th St. · Cleveland, Dhia 44I0G · Pbont 216 721-8300 Utrecht. Netherlands — Harshaw-Van Der Hoorn N.V. Frankfurt, W. Germany— Harshaw Chemie GmbH Circle No. 73 on Readers' Service Card
M a n o m e t e r s . Condensed Catalog 22 pages, describes a variety of nometers. Meriam Instrument 10920 Madison Ave., Cleveland, 44102
200, ma Co., Ohio 616
Recording Potentiometric Titrators a n d Combititrators. Bulletin BR-170 describes the M e t r o h m recording p o tentiometric t i t r a t o r s , a n d Bulletin B R 173 describes the M e t r o h m recording combititrators for p H stat and other ti trations. B r i n k m a n n I n s t r u m e n t s Inc., Cantiague Rd., W e s t b u r y , Ν . Υ . 11590 617
Differential
Thermal
Analysis.
A
4-page brochure describes the T h e r m o graph, a low-cost differential thermal analyzer. Sample t h e r m o g r a m s are in cluded. E . I. d u P o n t de N e m o u r s & Co., Inc., Wilmington, Del. 19898 6 1 8
Process
Gas
Chromatograph.
Dynamic IR compensation permits precise half-wave potential measure ments with the Model S S P - 2 at both fast and slow scan rates. T h i s is t h e latest h i g h - s p e e d , s i n g l e sweep polarographic system with image s t o r a g e f r o m C h e m t r i x . I t i s t h e only o s cillographic polarography system with: 1) D y n a m i c a l l y - c o n t r o l l e d p o t e n t i a l . 2) I m a g e s t o r a g e u p t o o n e h o u r . 3) C y c l i c d i s p l a y of b o t h c a t h o d ic a n d a n o d i c p e a k s . 4) 0.5, 1 , a n d 2 - v o l t c e l l s c a n r a n g e s . 5) C e l l s c a n d u r a t i o n s f r o m 0.1 t o 10 s e c o n d s . 6) S i n g l e s c a n s t r i g g e r e d b y d r o p f a l l . 7) F i r s t a n d s e c o n d d e r i v a t i v e m o d e s . 8) D i s p l a y o f I T c u r v e s .
T h e greater IR d r o p c h a r a c t e r i s t i c s of l o w - c o n c e n t r a t i o n e l e c t r o l y t e s is i l l u s t r a t e d in t h i s p h o t o g r a p h of t w o s i n g l e s c a n s s t o r e d o n t h e face of t h e c a t h o d e - r a y t u b e . B o t h peaks are I n d i u m in 0.1 M K C I w i t h a c a t h o d i c cell s c a n of 0.5 volt s t a r t i n g at 0.4 volt negative. T h e peak at r i g h t is t h e r e s p o n s e w i t h t h e t w o - e l e c t r o d e s y s t e m s h o w i n g p o t e n t i a l d i s p l a c e m e n t , as c o m p a r e d t o t h e peak at left in w h i c h t h e IR c o m p o n e n t of t h e e l e c t r o l y t e is c o m p e n s a t e d f o r by t h e c o r r e c t i v e a c t i o n of t h e S S P - 2 t h r e e electrode system. Model SSP-2 Three-Electrode P o l a r o g r a p h i c A n a l y z e r S y s t e m . . . $2790 Model SSP-1 Two-Electrode P o l a r o g r a p h i c A n a l y z e r S y s t e m . . . $2685 W r i t e f o r y o u r free c o p y of t h e new b o o k l e t , " A p p l i c a t i o n s of S i n g l e - S w e e p P o l a r o g r a p h y with the Storage Oscilloscope."
An
8-page, illustrated bulletin describes t h e Model 26-222A process c h r o m a t o g r a p h designed for single-stream analysis of either liquid or gas. T h e unit is p a r t i c ularly a d a p t e d for closed-loop control. Process Analyzers, Inc., 5405 Griggs Rd., Houston,"Texas 77021 619
U. S. Sales Prices F.O.B.
Factory
CHEMTRIX, INC. Instrumentation for Science P.O. Box 725
Beaverton, Oregon 97005
(503) 6481434 Circle No. 144 on Readers' Service Card VOL.
3 9 , N O . 1 1 , SEPTEMBER 1 9 6 7
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167
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