cary instruments
1
Cary 401. The Cary 401 Vibrating Reed Electrometer, the most accurate in the world, detects currents of 10" 17 ampere, charges as small as 5 χ 10" 16 coulomb, and potentials down to 2 χ 10" 5 volt from high impedance sources. Its standard features include solid state circuitry, multiple resistor input switching, remote input shorting, 1-second critically damped response time, and measurement of potentials from grounded sources. Modified versions offer critically damped response times of 0.5 and 2 seconds, and range changing can be computer controlled. So, if your application is in mass spectrometry, radioactivity, physical measurement or biomedical research, the Cary 401 can tackle just about any problem you've got to solve. For more information on the top vibrating reed electrometer commercially available, write Cary Instruments, a Varian subsidiary, 2724 S. Peck Road, Monrovia, California 91016. Ask for data file P203-22. Still the most sensitive, stable, and reliable electrometer on this planet. CIRCLE 4 3 O N READER SERVICE CARD tions of the statement, "It is surprising how little information is available on . . ." This was probably true in 1965-66 when most of the manuscripts included in this work were apparently written, but the intervening years have pro- duced a massive outpouring of data (much of it attributable to the authors included in this work) which have sup- plied much of the missing information. Examination of the cited literature re- veals that of 1176 references in the first six chapters, only 15 are later than 1966, and of these, six were added after the main text was completed. One chapter has no citation later than 1965, and two have one apiece from 1966. Only Chapter 7 is reasonably up-to- date. These books are generally error free, but several mistakes that are particu- larly disturbing were found. On page 117 there is a figure illustrating the miticide Pentac without any accom- panying text. On page 97 there is an error in the formula for dipterex. In Chapter 1 and in the index, carbon disulfide is referred to by the archaic term carbon 6isulfide, but in Chapter 2 it is correctly identified. Again, in the index there is a listing for carbon sul- fide, whatever that is. Finally, both the major divisions of each chapter and the minor subdivisions are identified be- arable numerals, making it difficult to locate a particular section referred to in the text. In summary, after reviewing these two books, I would not recommend their purchase to anyone, especially since it appears that the complete series will cost more than $100. For that sum of money the reader should receive much more than is presented in these volumes. Analysis of High Resolution NMR Spec- tra. R. J. Abraham, χ + 324 pages. American Elsevier Publishing Co., Inc., 52 Vanderbilt Ave., New York, NY 10017. $30.50 Reviewed by P. L. Con'o, Department of Chemistry, University of Kentucky, Lex- ington, KY 40506 The asserted purpose of this mono- graph is to answer the question, "Here is a spectrum, how do I analyze it?" The attempt to answer this question endows the book with a pragmatic quality that will undoubtedly appeal to students and those readers whose in- terest, in magnetic resonance is de- termined by its applicability in other research areas. The book includes tables of resonance frequencies and signal intensities for the common spin systems, but the emphasis is on their use in spectral analysis, not on their derivation. General properties of spin systems required in detailed analyses are illustrated for special cases, followed by statements of the general results, usually with reference to more detailed expositions. Most of the techniques in common practice are described with illustrative examples, and an entire chapter is de- voted to the use of computers in spec- tral analysis. A notable omission is the absence of a discussion of multiple quantum transitions, which frequently pro\'ide a useful complement to steady- state and multiple resonance experi- ments. The most attractive feature of the book is the collection of experimental spectra, accompanied by detailed de- scriptions of the methods and pitfalls of spectral analysis. The book is worthy of recommendation on this score alone. The most unattractive feature of the book is its price, which is exorbitant and probably out of the financial range of many potential readers. New Books Analytical Chemistry of Molybdenum and Tungsten. W. T. Elwell and D. F. Wood, xi + 277 pages. Per- gamon Press, Ltd., Maxwell House, Fairview Park, Elmsford, NY 10523. 1971. $22.25 The increasing importance of produc- ing materials for high-temperature ap- plications has resulted in extensive re- search and development programs in- volving molybdenum and tungsten. Sustained interest in these same metals for other purposes, e.g., in the produc- tion of alloyed steels, has contributed to the growing importance of the analyti- cal chemistry of these metals and has resulted in significant advances in the principles and methods used for their determination and analysis. This book includes the latest information on chem- ical and instrumental methods of analy- sis involving solvent extraction, polar- ography, atomie absorption, X-ray fluorescence, and radiochemical analy- sis as well as classical chemical de- terminations. Detailed methods for determining molybdenum and tungsten in typical samples and the analysis of these metals and their alloys by both classical and modern techniques have also been included. Fairly extensive lists of references are given. This text is Volume 47 of the "International Series of Monographs in Analytical Chemistry." 64 A . ANALYTICAL CHEMISTRY, VOL. 44, NO. 6, MAY 1972 New Books cary instruments
Transcript of cary instruments
Cary 401. The Cary 401 Vibrat ing Reed Electrometer, the most accurate in the wor ld , detects currents of 10"1 7
ampere, charges as small as 5 χ 10"1 6
coulomb, and potentials down to 2 χ 10"5 volt f rom high impedance sources. Its standard features include solid state circuitry, mul t ip le resistor input switching, remote input shorting, 1-second critically damped response t ime, and measurement of potentials f rom grounded sources.
Modi f ied versions offer crit ically damped response times of 0.5 and 2 seconds, and range changing can be computer control led.
So, if your application is in mass spectrometry, radioactivity, physical measurement or biomedical research, the Cary 401 can tackle just about any problem you've got to solve.
For more information on the top vibrating reed electrometer commercial ly available, wr i te Cary Instruments, a Varian subsidiary, 2724 S. Peck Road, Monrovia, California 91016. Ask for data f i le P203-22.
Still the most sensitive, stable, and reliable electrometer on this planet.
CIRCLE 43 O N READER SERVICE CARD
tions of the statement, "It is surprising how little information is available on . . ." This was probably true in 1965-66 when most of the manuscripts included in this work were apparently written, but the intervening years have produced a massive outpouring of data (much of it attributable to the authors included in this work) which have supplied much of the missing information. Examination of the cited literature reveals that of 1176 references in the first six chapters, only 15 are later than 1966, and of these, six were added after the main text was completed. One chapter has no citation later than 1965, and two have one apiece from 1966. Only Chapter 7 is reasonably up-to-date.
These books are generally error free, but several mistakes that are particularly disturbing were found. On page 117 there is a figure illustrating the miticide Pentac without any accompanying text. On page 97 there is an error in the formula for dipterex. In Chapter 1 and in the index, carbon disulfide is referred to by the archaic term carbon 6isulfide, but in Chapter 2 it is correctly identified. Again, in the index there is a listing for carbon sulfide, whatever that is. Finally, both the major divisions of each chapter and the minor subdivisions are identified bearable numerals, making it difficult to locate a particular section referred to in the text.
In summary, after reviewing these two books, I would not recommend their purchase to anyone, especially since it appears that the complete series will cost more than $100. For that sum of money the reader should receive much more than is presented in these volumes.
Analysis of High Resolution NMR Spectra. R. J . Ab raham, χ + 3 2 4 pages. Amer ican Elsevier Publ ishing Co., Inc., 52 Vanderbi l t Ave., New York, NY 10017. $30 .50
Reviewed by P. L. Con'o, Department of Chemistry, University of Kentucky, Lexington, KY 40506
The asserted purpose of this monograph is to answer the question, "Here is a spectrum, how do I analyze it?" The attempt to answer this question endows the book with a pragmatic quality that will undoubtedly appeal to students and those readers whose interest, in magnetic resonance is determined by its applicability in other research areas. The book includes tables of resonance frequencies and signal intensities for the common spin
systems, but the emphasis is on their use in spectral analysis, not on their derivation. General properties of spin systems required in detailed analyses are illustrated for special cases, followed by statements of the general results, usually with reference to more detailed expositions.
Most of the techniques in common practice are described with illustrative examples, and an entire chapter is devoted to the use of computers in spectral analysis. A notable omission is the absence of a discussion of multiple quantum transitions, which frequently pro\'ide a useful complement to steady-state and multiple resonance experiments.
The most attractive feature of the book is the collection of experimental spectra, accompanied by detailed descriptions of the methods and pitfalls of spectral analysis. The book is worthy of recommendation on this score alone.
The most unattractive feature of the book is its price, which is exorbitant and probably out of the financial range of many potential readers.
New Books
Analytical Chemistry of Molybdenum and Tungsten. W. T. Elwell and D. F. Wood, xi + 277 pages. Per-gamon Press, Ltd. , Maxwell House, Fairview Park, E lmsford, NY 10523. 1 9 7 1 . $22.25
The increasing importance of producing materials for high-temperature applications has resulted in extensive research and development programs involving molybdenum and tungsten. Sustained interest in these same metals for other purposes, e.g., in the production of alloyed steels, has contributed to the growing importance of the analytical chemistry of these metals and has resulted in significant advances in the principles and methods used for their determination and analysis. This book includes the latest information on chemical and instrumental methods of analysis involving solvent extraction, polar-ography, atomie absorption, X-ray fluorescence, and radiochemical analysis as well as classical chemical determinations. Detailed methods for determining molybdenum and tungsten in typical samples and the analysis of these metals and their alloys by both classical and modern techniques have also been included. Fairly extensive lists of references are given. This text is Volume 47 of the "International Series of Monographs in Analytical Chemistry."
64 A . ANALYTICAL CHEMISTRY, VOL. 44, NO. 6, MAY 1972
New Books
cary instruments
