NEW PRODUCTS Finished strips a r e analyzed i n a photoelectric u n i t t h a t automatically t r a n s l a t e s d y e density i n t h e strips into a p e n - d r a w n curve of c o m p o n e n t concentration a n d a corresponding saw-tooth line which gives a direct integration of t h e areas u n d e r a n y selected portions of t h e curve. 18
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Distillation Control
N•M•R-
as revealing as your fingerprint Because it offers a completely fresh approach to the study of chemical systems, Varian's Model V-4300 High Resolution n-m-r (nuclear magnetic resonance) Spectrometer has become an instru ment of major importance to analytical chemists everywhere. Now at work in research laboratories throughout America, this remark able new device detects signals from H', F'f P3! B", C ? Hz, Η'ή and several other nuclei, revealing the character of the chemi cal environment. High Resolution n-m-r techniques permit rapid, non-destructive analysis of small liquid samples, including melted solids, solids in solution and liquefied gases. Prominent applications include iden tification of functional groups, equilibrium and kinetic studies, assignment of structural formulas and analysis of multi-component mixtures.
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SPECTRUM OF TR1HUO
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DATA
=CFR, the exact spacing ot mev [fom , h e re . fte s u b s t i t - n t - ™ . ^ ^ * \ m makes .11 of t e «tricted rotation about the ooume ou ^ lu nenuc.ei structurally " ^ - ^ J ^ L mtaract.ons bein each group is a manrfes >on th m ^ c PW „ |ead t0 usefu | structwenpairsoHloor1ne« cf
Sample: CFz=CFCl Volume: .03 cc. Frequency: 30 mc. Field: 7500 gauss Sweep Rate: 50 milligauss/sec. Zero of Reference. 9 Magnetic field at F nucisi in perfluorocyclobutane
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FOR THE COMPLETE STORY . • • •
Technical Information Data Sheets n-m-r Table
THE LEADERSHIP
VA
V A R I A N P A L O
A L T O
associates 4,
C A L I F O R N I A
For further information, circle number 46 A on Readers' Service Card, page 37 A
46 A
Intermediates. Eight-page bulletin covers properties a n d uses of 14 inor ganic halogen compounds available from Michigan Chemical Corp. 21
Warburg A p p a r a t u s . Six-page folder describes construction a n d operation of t w o circular, r o t a t a b l e manometric research units for gas microanalysis. Bronwill Scientific, I n c . (Models VV and rVL). 23
-10
-20
On Varian's Model V-4300 High Resolution n-m-r Spec trometer, as well as the Model V-4200 Variable Frequency n-m-r Spectrometer, write to the Special Products Division for:
MARK OF
A n a l y s i s of A l k a l i e s . Revised edition of bulletin on analytical methods for alkalies contains information on new procedures a n d reagents, as well as recalculated analytical factors. Solvay Process Div., Allied Chemical & Dve Corp. (Bull. 9). 20
Biochemicals. Price list of 8 pages covering amino acids, peptides, poly peptides, enzymes, hormones, carbohy drates, and other biochemicals offered by M a n n Research Laboratories, Inc. 2 2
110 30
MANUFACTURERS' LITERATURE
. .... n .., f t i 0 1 ,marri Chemical
Tho samole was
NUCLEAR
An instrument for control of vacuum distillations is being built b y Weiller I n s t r u m e n t s Corp. T h e Resi-Twin is provided with eight sockets t o take plug connectors of resistance thermometer bulbs. T w o of the bulbs are connected to a differential control which is de signed t o maintain a constant tempera ture difference between t w o points of the still. A switch on t h e upper panel connects the indicator bridge either t o t h e con trol or to switches on t h e lower panel. I n the first position, control and bridge operate from t h e same b u l b ; in t h e second position, a n y one of six bulbs may be connected t o t h e bridge. T h e instrument measures a n d controls t o 400° C. 19
Bulletins
Balances. Bulletin of 8 pages d e scribes construction a n d performance of various types of analytical balances, including s t a n d a r d , semimicro, a n d micro models. Fisher Scientific Co. (Ball. FS-207). 24 Vacuum Pumps. Four-page folder covers design, specifications, a n d appliFor further information, see coupon on page 37 A ANALYTICAL
CHEMISTRY
