A N A L Y T I C A L C H E M I S T R Y BOOK REVIEWS

Advances in Magnetic Resonance. Vol. 1. John S. Waugh, Ed. xi + 413 pages. Academic Press, Inc., Ill Fifth Ave., New York, Ν. Υ. 10003. 1966. $15.

Reviewed by Wallace S. Brey, Jr., Department of Chemistry, University of Florida, Gainesville, Fla.

This volume is described as the first of a series which will cover nuclear and electron spin resonance, quadrupole spectroscopy, and related areas such as molecular beams, optical pumping, and microwave spectroscopy.

The contributions in the first volume include several with a mathematical-theoretical viewpoint, several extensive compilations of data, and one review which is more general in nature. This review is likely to be of most interest to analytical chemists; by D. R. Eaton and W. D. Phillips, it deals with "Nu­clear Magnetic Resonance of Paramag­netic Molecules," covering both basic theory and typical applications.

The longest section, "Geminal and Vicinal Proton-Proton Coupling Con­stants in Organic Compounds," by A. A. Bothner-By includes some hundred pages of tables of constants critically selected from the literature, mostly that of 1962 and 1963. This extensive cat­alog is preceded by a concise review of available generalizations about coupling constants. Unfortunately, any catalog of data of this type must appear unwieldy at first inspection. Then, too, a more up-to-date coverage might have been desirable, but neither of these facts detracts from the usefulness of this compilation to a worker in the field. A similar compilation of hyper-fine splitting constants is presented in "Electron Spin Resonance of Radical Ions" by K. W. Bowers. The table is "hopefully complete through midsum­mer, 1964."

Entitled, "The Theory of Relaxation Processes," the first section in the book is a revised version by A. G. Redfield of his often-referenced paper which ap­peared originally some years ago in an IBM journal. It is very helpful to have the presentation in readily avail­able form. The next contribution, "Chemical Rate Processes and Mag­netic Resonance," by C. S. Johnson, al­though spiced with a few examples, is essentially a discussion of the principles and mathematical relations involved in the application of both nuclear and electron resonance, and of both contin­uous wave and transient methods, to the determination of rates of relatively

rapid reactions. M. Barfield and David M. Grant, in "Theory of Nuclear Spin-Spin Coupling," review a field in which both have made significant con­tributions. Methods, equations, limita­tions, and advantages of various ap­proaches to the calculation of coupling constants, either ah initio or with aid of other molecular parameters, are treat­ed.

This is a valuable volume, at least for anyone who is actively interested in magnetic resonance, carefully produced, and, by today's standards, reasonably priced. One might hope, however, that a January 1966 publication date would imply more extensive coverage of 1964 and early 1965 literature than is found in several of the chapters.

Purification of Laboratory Chemi­cals. D. D. Perrin, W. L. F. Armar-rego, Dawn R. Perrin. vii + 362 pages. Pergamon Press Inc., 21st St., Long Island City, New York 11101. 1966. $11.

Reviewed by David H. Freeman, National Bureau of Standards, Wash­ington, D. C. 20234.

This book presents a compilation of 3000 compounds, arranged alphabeti­cally, and their respective purification procedures. There are 60 pages of ele­mentary introduction. Most of the compounds are organic, and most of the procedures are surprisingly brief. For example, 40% of the entries are like the following: "Glutamine. Cryst. from water." For one compound out of seven, reference to the literature is given.

This tabulation of purification rec­ipes is compiled from the literature without further comment. At best, the work is uncritical, and the recipes are frequently of uncertain usefulness. The conventional aspects of chemical purifi­cation, such as the identification of like­ly contaminants, measurement of their concentrations, optimized methods of lowering their concentrations, and help­ful technical details, are dismissed with the understanding that the reader may already be familiar with them. In an isolated but serious instance, the proce­dure given for drying hydrogen bro­mide gas with magnesium perchlorate is apt to lead to an explosion [M. J. Stross and G. B. Zimmerman, Ind. Eng. Chem. 17, 70 '(1939)] unless the nec­essary and unmentioned precautions are taken.

This book is aimed at an important gap in the literature. Its success in closing this gap is unfortunately lim­ited and fragmentary.

Zone Melting. Hermann Schild-knecht. xii + 222 pages. Academic Press. Ill Fifth Ave., New York, Ν. Υ. 10003. 1966. $9.

Reviewed by Henry E. Wood, Dow Chemical Co., Midland, Mich.

The first section of this book sets forth the theory necessary to an under­standing of the zone-melting process through a discussion of normal freezing and concise descriptions of the various types of solid-liquid phase equilibria that occur in binary and ternary mix­tures. The theory is then applied to the zone melting of eutectics and systems involving mixed crystal formation. The second section is concerned with the equipment needed to produce, main­tain, and move the narrow, sharply bounded molten zone that is essen­tial to the success of the zone-melting process. Since heat conduction is the major problem in this connection, there is also some theoretical discussion of the temperature gradient in the melt, and of the methods of heating and cooling. Photographs and drawings are included of zone-melting apparatus constructed by numerous investigators for a variety of purposes. The number of successful applications of this relatively new sepa­ration process that are cited in the final section are a convincing demonstration of its utility.

All aspects of zone melting are ade­quately and succinctly covered in this book. Although the German original was not available for comparison, the quality of the translation appears to be excellent; only a few sentences were noted that had a definitely Teutonic turn of expression. The format and printing are satisfactory, and the proofreading was done with care.

This book is especially recommended to the attention of those who are about to use the technique of zone melting for the first time. After mastering its con­tents, the novice should be able to con­struct an apparatus and process his sample with no more difficulties than normalfy are encountered in such un­dertakings. Even an experienced prac­titioner might read it with profit.

It was the author's expressed inten­tion to emphasize those features of the theory, apparatus, and application of zone melting that are of greatest inter-

VOU 38, NO. 1 3, DECEMBER 1966 · 7 3 A

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est to the laboratory worker, and he has succeeded admirably. The reviewer re­gards this as the most useful book on the subject that he has yet read. Progress in Nuclear Energy. Series

IX. Analy t ica l Chemistry. Vo l . 5. Instrument and Chemical Analysis Aspects of Electron Mi ­croanalysis and Mic roana lys is . Herbert A. Elion. ix + 256 pages. Pergamon Press, Inc. J,.Jr01, 21st St., Long Island City, Ν. Y. 11101. wee. $14.

Reviewed by L. S, Birks, V. S. Naval Research Laboratory, Washing­ton, D. C. 20390.

I t is only about 15 years since the be­ginning of electron probe analysis but the subject has attracted great atten­tion because of the instrument's unique ability to perform quantitative chemi­cal analysis on selected, micron-sized local areas in alloys, minerals, biologi-cals, etc. Many papers and' several books have been published outlining principles and practice. The most re-

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cent of these is the book by H. A. Elion. The book starts with an introductory chapter on historical background which emphasizes the roles of the corporations with which the author has been con­nected. This is followed by chapters on electron optics, x-ray crystal optics, de­tectors, specimen préparation, factors in quantitative analysis, and miscellane­ous related topics.

Chapter headings notwithstanding the reader finds that the book is clearly divided into two distinct areas, namely a detailed discussion of electron optics which takes up 30% of the book fol­lowed by a general, descriptive coverage of the rest of the subject. Within the area of, electron optics, Dr. Elion takes a somewhat low position on the merits of afocal electron lenses but unfortu­nately does not give any quantitative values for their aberrations . compared with usual electron lenses. Other re­searchers more versed in electron optics than this reviewer have stated in the past that the theoretical advantages as­cribed by Elion to afocal lenses do not exist in practice. In addition, most an­alysts have no control over the electron optics design of instruments; thus the lengthly discussion is largely wasted on them.

Contrasted with the overly long sec­tion on electron optics, many of the topics on which the analyst, especially the relative newcomer, needs specific guidance, are covered in a very cursory fashion or only by references to the lit­erature. For instance, there is no dis­cussion on precision or accuracy (they are not even listed in the index) ; there are only three sentences on the impor­tant shift of pulse amplitude with counting rate for proportional detec­tors; procedures for converting meas­ured x-ray intensity to chemical com­position (quantitative analysis) arc dis­cussed so briefly that the analyst has no equations to actually use.

In favor of the book, it should be said that, except for the electron optics sec­tion, the material is very readable. Also the bibliography is extensive and seems quite complete.

Chemical Principles in Calculations of Ionic Equilibria. Em.il J. Mo,r-golis. xi + 482 pages. The Macinil-lan Co., 60 Fifth Ave., New York, N. Y. 10011. 1966. $7.95. (Paper­back: $3.95).

Reviewed by Richard A. Durst, De­partment of Chemistry, Boston Col­lege, Chestnut Hill, Mass. 02167.

The material presented in this text is without doubt very important in. the overall education of a chemist, but un­fortunately has been relegated in recent

74 A ANALYTICAL CHEMISTRY

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years to the nebulous area in the curric­ulum between general chemistry and "modern" analytical chemistry. Pres­ently there is not enough time to cover chemical calculations in depth in gen­eral chemistry and most analytical courses stress instrumental techniques. In the reviewer's opinion, this book is best suited as a text for an independent, one-semester course on ionic equilibria and solution chemistry for chemistry majors in their second or third semes­ter. This would have the additional advantage that general chemistry could become somewhat more descriptive than the present quantitatively-ori­ented course which often loses students in a maze of derivations, equations, and calculations.

The first two chapters are primarily a review of mathematical operations and chemical definitions and might bet­ter have been summarized in an appen­dix.

Errors noted in this text were mini­mal. In working representative sam­ples of the problems, no calculation er­rors were found. However, in the de­scriptive sections several points deserve comment. On page 52, the term "pseudo-salt" is applied to mercuric chloride to indicate its covalent nature. I doubt a need exists to coin new and ambiguous terms to describe an extreme in the continuous gradation that occurs in bond covalency. I t gives the impres­sion that there are such things as 100% ionic bonds. On page 293, the author perpetuates the error of the mechanism by which the glass electrode functions. Although its mode of operation is not completely understood, it is now gener­ally accepted that hydrogen ion diffu­sion through the glass membrane does not occur, but rather it is an ion ex­change process in which hydrogen ions from the solution exchange with alkali metal ions in the surface layer of the glass. The potential difference that de­velops on the external surface of the glass is thereby dependent on the hy­drogen ion activity in the solution. Fi­nally, on page 318, I question the state­ment that metallic sodium forms at the mercury cathode instead of hydrogen gas even in an acid solution.

The book contains a very good selec­tion of worked problems totaling about 100 and an abundance of over 200 sup­plementary problems representing virtually all facets of the material dis­cussed. The most notable exception is in the section on redox titrations where the description of this type of calcula­tion is quite good, but there is practi­cally nothing about them in the inter­pretive exercises and problem section. In most cases the worked problems are clearly explained in a logical, stepwise manner.

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There is a conspicuous lack of figures and diagrams throughout , and in many cases their inclusion would greatly clar­ify the discussed material . Also missing are references to related sources of in­formation which might be useful to the serious s tudent . Finally, references in the text section to per t inent worked problems a t the end of each chapter would have been helpful in correlating the theory and calculations.

In spite of the above criticisms, this book does help fill a gap in texts avail­able for the teaching of ionic equilib­r ium theory and calculations. I t

t rea t s ionic equilibrium in depth and in this respect fulfills the author ' s aims in writing a supplementary text for gen­eral chemistry and quant i ta t ive analy­sis. A book of this type deserves inclu­sion into the chemistry curriculum bu t unfortunately an already overcrowded schedule of courses may prevent its use except as a supplemental text.

Standard Methods of Chemical Anal­ysis . 6th e d . Vols, HI A and II IB, Instrumental Methods . Frank J. Welcher, ed. xviii + 974 and xi + 10Ιβ pages. D. Van Nostrand Co.,

Inc., 120 Alexander St., Princeton, N. J. 1966. $ΰ0 both parts {not sold separately).

Reviewed by F. E. Beamish, De­partment of Chemistry, University of Toronto, Toronto, Ontario, Canada.

This book, prepared by 86 authors , contains in Volume A a discussion of 41 ins t rumental methods of analysis in­tended to provide a general unders tand­ing of the principles of ins t rumenta­t ion; as well as the scope, advantages , and limitations of each technique. Each method includes a discussion of the basic principles and the required equations, the ar rangement and opera­tions of the functional par t s , and de­tailed direction for each s tep of the technique. P a r t I I of Volume A and Β deal with the application of the instru­mental methods to special materials which in general are the same as those of Vohime I I with some exceptions in the ease of those materials which have received adequate coverage in Volume I I of this scries. Included in the chap­ters dealing with materials are new chapters on food and semiconductors. Each of the 23 chapters on materials provides practical information on ma­nipulation, accuracy of measurement , and potential sources of error for the various instrumental methods.

In Volume A all of the ins t rumental methods which are included, while they cannot be considered s tandard methods in the sense used in previous volumes, have been widely used, or a t least, ef­fectively used for various purposes for which a noninst rumental method might have, for any reason, proved to be in­ferior. In addition, methods have been included where they are known to be useful in solving special problems and where they may be helpful in suggest­ing possible approaches for the develop­ment of other required methods. The design of the volumes will st imulate in­terest in the extension of the various in­s t rumenta l techniques to the solving of analytical problems. Thus , it is not only a book of recipes but also a source of inspiration for the analytical re­searcher. Essentially, while the book is directed toward the practising analyst , it should be within the reach of the ana­lytical novice and most certainly it should be at the disposal of the research analyst . Some of the chapters—e.g., the electrometric and radioisotopic methods—could be considered in the na ture of an upper level analytical text­book with details and information of practical value too often lacking in those a t present available. However, there is a degree of oversimplification in some of the descriptions of ins t rumental methods inevitable in a treatise so com­prehensive, and in such instances—e.g.,

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the polarographic section—an advanced supplementary text would be needed for a complete understanding of the scope of usefulness. In general, the bibliogra­phies associated with each chapter are up to date and include in many cases much unpublished material.

In this reviewer's opinion, the two volumes accomplish the purpose for which they were written and indeed comprise one of the most effective and concise records of instrumental analyt­ical techniques available. No practis­ing analyst, particularly one in a super­visory position, or any research analyt­ical chemist should be denied continued access to these two volumes.

Tracte Analysis: Physical Methods. George H. Morrison, ed. xx + S82 pages. Interscience Publishers, John Wiley & Sons, Inc., 605 Third Ave., New York, Ν. Υ. 10016. 1965. $16. Reviewed by J. C. White, Analyti­

cal Chemistry Division, Oak Ridge Na­tional Laboratory, Oak Ridge, Tenn.

"Happiness is different things to dif­ferent people." So go the words to a popular tune, made even more ubiqui­tous by adaptation to a television com­mercial. The words are apropos to "trace analysis"·—different meanings to different people. Accordingly, if one is to write a suitable book on trace analy­sis, it behooves the author to state his objectives clearly and to develop them in a logical manner. Unless this goal is achieved, or at the least a strong effort made in this direction, a treatise on trace analysis will result in a hodge­podge of data and information of quite limited use to anyone in general or par­ticular.

Professor Morrison is at the forefront in a relatively new field of analytical chemistry that presents a truly difficult challenge to analytical chemists. As professor of chemistry and director of analytical facilities of the Materials Science Center at Cornell University, he is intimately involved in the analysis of high purity materials. The book, however, is not directed entirely to pure materials. Professor Morrison has con­sidered trace analysis from a wide per­spective and has produced a well-planned, informative, and useful book to anyone involved in the many faceted aspects of trace analysis.

He persuaded a uniformly competent group of authorities to aid him in the task. This, in itself, is a strong at­tribute of the book. The individual au­thors have also written uniformly well; with the organization and editing by Professor Morrison, the result is a book that reads easily without the usual, al­most expected jolts from chapter to

NEW BOOKS

chapter that characterize so many com­posite treatises.

Without disparaging the last eight chapters of the book, this reviewer was most impressed by the first four chap­ters. In the first Morrison and Skoger-boe discuss general aspects of trace analysis and point out the ubiquity of trace analysis. This chapter sets the tone of the entire book as it properly should. The next two chapters are ex­tremely interesting ones.

Chapter 2 is written by Ν. Β. Han-nay of Bell Telephone Laboratories; Chapter 3 by W. II. Allaway of the U. S. Plant, Soil and Nutrition Labora­tory. Hannay surveys the important physical and chemical effects of trace impurities on solids and correlates these effects with the analytical problems they cause. The net result is a discus­sion that demonstrates the necessity for the analytical chemist to be a full part­ner in the interdisciplinary materials re­search team. Allaway's chapter con­cerns, trace elements in biological sys­tems. He too provides the background for the analytical problems that exist and conveys the reasons for the biolo­gists' interest in trace elements. Thus these chapters present the raison d'etre for trace analysis which adds immensely to the effectiveness of the book.

Chapter 4 "Separations and Preeon-centrations" by A. Mizuike contains much practical information not usually found in such compilations. Analytical chemists will find this a most welcome chapter.

The remaining chapters are devoted to Spectrophotometry and Fluorometrjr (K. L. Cheng) ; Emission Spectrochemi-cal Methods (A. J. Mitteldorf) ; Flame Emission and Absorption Methods (R. P. Weberling and J. Γ. Casgrove) ; X-Ray Emission Spectrography (I. Adler and H. J. Rose, J r . ) ; Nuclear Methods (V. P. Guinn and II. R. Lukens, J r . ) ; Electrochemical Methods (J. K. Tay­lor, E. June Maicnthal, and G. Mari-nenko) ; Mass Spectrometry (John Roboz) and Xon-Specific Methods for Analysis of Solids (L. R. Weisberg). Essentially all of the information pre­sented can be found in other books, of course in greater detail. The thor­oughness of the discussion of the var­ious techniques is sufficient, however, for this purpose. Most of the chapters contain a list of general references in addition to the usual copious specific references. These general references add much to the book.

The typography is first class and the book is free from errors. This reviewer found none but was not intentionally looking for any either. The book may be slanted toward trace analysis in ma­terials research but Morrison does suc­ceed in presenting a clear picture of

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7 8 A · ANALYTICAL CHEMISTRY

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trace analysis. The book is recom­mended to all analytical chemists.

Photochemistry. Jack G. Calvert, James N. Pitts, Jr. xvii + 899 pages. Interscience Publishers, 60S Third Ave., New York, Ν. Y. 10016. 1966. $19.50. Reviewed by H. H. Richtol, De­

partment of Chemistry, Rensselaer Polytechnic Institute, Troy, N. J.

The time is certainly ripe for new books to appear on photochemistry, as is pointed out by the authors in the preface. This book is meant to serve as both a current textbook and a reference source for modern photochemistry, and succeeds admirably on both counts.

After a brief introductory chapter which will bo helpful to senior under­graduate and beginning graduate stu­dents, the next two chapters deal with the interaction of light with atoms and simple molecules. These two chapters begin with a survey of spectroscopy and then relate this area to primary photophysical processes, such as fluores­cence, phosphorescence, energy transfer, etc. The primary photophysi­cal processes are presented well in these chapters. A good introductorj' survey to mercury-photosensitized reactions is contained in the second chapter, and is documented nicely with diagrams and clear photochemical equations.

I found chapter 4 to be a particularly enjoyable chapter. It covers the pri­mary photophysical processes of poly­atomic molecules, and in the brief span of about HO pages, this chapter intro­duces one to the subject matter that is perhaps at the heart of current research in organic photochemistry. Students as well as more experienced research work­ers will find this coverage of the mul­titude of possible excited state processes to be particularly helpful.

Chapter 5 catalogs a large number of photochemical reactions according to their chromophoric groups. For each molecule surveyed, chemical equations are given as well as quantum yields and experimental conditions. The huge amount of photochemical information in this chapter is necessarily in abbrevi­ated form, yet is concise and well docu­mented. I strongly suspect that this chapter will be used more often for its reference material than any other chap­ter in the book.

Chapter 6 should be helpful to begin­ning students in photochemistry. I t deals with the experimental and kinetic information that one must obtain in order to determine the mechanism of a photochemical reaction. The authors indicate that the techniques discussed in this chapter do not represent the final word, but the need for a new and

unique experiment always exists. Finally, the last chapter is concerned

with the experimental tools of photo­chemistry. An excellent exposition is given on light sources, monochromators, filters, optics, and actinometers. The practical nature of this chapter should make it highly popular, and will fre­quently be referred to by young re­searchers.

The book appears to bo remarkably free of printing errors (I found only three) and the tables and figures are quite clear. Professors Calvert and Pitts obviously write with authority, and the subject matter chosen for em­phasis and de-emphasis could not have been arrived at lightly. As a chemist, I invariably agreed with the authors' choice of subject matter. Topics on photobiology, photochemistry of the solid state, etc., were understandably given limited coverage. The book is well documented throughout, and con­tains over 1600 references. A special feature which will aid in the use of the book as a text are the problems at the end of most of the chapters.

This book is a welcome addition to the area of photochemistry, and will prove useful to people in allied fields as well.

Atomic Absorption Spectroscopy. James W. Robinson, xi -f- S04 pages. Marcel Dekker, Inc., 95 Madison Ave., New York, Ν. Υ. 10016. 1966. $9.75. Reviewed by R. Lockyer, Hilger

ù- Watts, Ltd., 98 St. Paneras Way, Camden Rd., London, N. W. 1, Eng­land.

In his preface, the author draws at­tention to the difficulty experienced in covering completely a subject, such as atomic absorption, in which fresh work is continually appearing. He is, I think, to be congratulated in achieving a very up-to-the-minute account.

Attention is rightly focussed on basic principles, but it is a pity that Chapter 2, which deals with equipment, does ap­pear to suffer from oversimplifications, no doubt imposed by the need for brev­ity. For example (p. 10) the use of a flame as a source of free atoms is hard­ly to be attributed to a "blind spot." Russel, Shclton, and Walsh in their original paper (1957) pointed out that " . . . this problem of complete atomisa-tion seems the outstanding problem . . . ," but the fact is that in spite of all the efforts to find an effective substi­tute, the flame is still the most generally useful atomiser.

Although emissive electrodes (p. 21) are coated with alkaline earth carbon­ates during manufacture, these are not of course the actual emitters as they re-

NEW BOOKS

quire an activation procedure which probably converts them to nonstoi-chiometric oxides.

The principal advantage of a prism monochromator (p. 47) is the gain in energy obtained at short wavelengths, but the basic design problem with any monochromator is to make effective use of its theoretical performance—the ex­tent to which it is attained is usually determined by the geometry of the ab­sorption part of the experiment—i.e., the disposition of the source, burner, and associated lenses and stops. In­strument makers will hardly support the view (p. 52) that a double-beam system offers any financial advantage over a single beam, surely the cost of the extra optics far outweighs any sav­ing on the electronics in these days of cheap stabiliser systems. These how­ever arc minor criticisms. Chapters 3 and 4 on analytical parameters and ap­plications, respectively, are exceedingly good. The section on recommended procedures is comprehensive and well documented. The descriptions of com·' mercial equipment are incomplete, but this is probably a criticism of the manu­facturers' publicity departments rather than of the author!

Particularly welcome is Chapter 5 which deals with oscillator strengths, vacuum ultraviolet lines, and atomic fluorescence. This is up to date and most interesting..

The book as a whole is eminently readable and is well produced, being pleasingly free from typographical er­rors. The price, $9.75, seems a little high even by today's standards, and this may deter chemists from purchasing in­dividual copies, but the book should, I think, find a place in all laboratories where atomic absorption techniques are used or contemplated.

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Mathematics for Scientists. Thor A, Bak, Jonas Lichtenberg. xiv + Jf87 pages. W. A. Benjamin, Inc., One Park Ave,., New York, Ν. Y. 10016. 1.966. $1,5. This book is directed to undergrad­

uate and graduate students in science and engineering to strengthen their mathematical background and aid them in the use of mathematics for solving scientific problems.

The book is divided into three parts : the first part deals with vectors, ten­sors, and groups ; the second part treats functions of one and several variables; and the third part presents advanced

Value is a balance by Roller-Smith

The LG0500MG is the result of over man Density Balance and the 50 years experience in the preci­sion balance field. And just one of 28 models made by Roller-Smith, ranging from 3 mg. to 50 grams. This complete line covers all appli­cations, and includes a Universal Yarn Numbering Balance, a Ber-

unique Rosano™ Surface Tensio-meter. Prices? Remarkably reason­able. Remember: for precision balances, look to Roller-Smith first.

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Circle No. 2 on Readers' Service Card

RAPID EQUIPMENT

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Add this unique $ 2 2 5 accessory to your existing IR spectrophotometer, and . . . 1. O b t a i n i m m e d i a t e q u a l i t a t i v e c h r o m a t o g r a m s o f speci f ic funct ional groups in your GC samples. 2. Get the same in format ion suppl ied by high cos t rapid scan ins t ruments as you capture and scan vapor phase peaks individually. New 2 .5cc Heated Micro Gas Cell is designed fo r f l ow or s ta t ic vapor samples, operates t o 250°C and f i t s ali IR spec t ropho tometers . For cur rent technical detai ls plus in format ion on our comple te line o f GC-IR accessor ies, con tac t :

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Circle Να. 98 on Readers' Service Card

VOL. 38, NO. 13, DECEMBER 1966 ·, 79 A

Model LG0500MG,

• Range 500 mg. • Accuracy ± 1 . 0 mg.

• Tared capacity 1500 mg. • Magnetically dampened

• Only $290

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