NEW BOOKS
the versatile LOOMIS laboratory press • Designed and engineered for multi ple laboratory use. • Forms KBr pellets and X-ray pellets. • Plastic molding and forming opera tion. • Adapts to extrusion and isostatic pressing. • Quick changeover with handwheel for accurate change of opening.
Loomis 20 ton press with compact power unit. 30 and 50 ton models also available.
• Sturdy design and construction pro tects expensive dies. Does all kinds of testing. Call or write:
MIDVALE-HEPPENSTALL
H MH
PRESSURE
EQUIPMENT
DIVISION
Nicetown, Philadelphia, Pa. 19140 Area Code 215 225-5000 Subsidiary of HEPPENSTALL COMPANY, Pittsburgh, Pa. Circle No. 61 on Readers' Service Card
New Retractive index Flow Monitor Ν ester Faust's Model 404 Refractive Index Flow Monitor provides contin uous readout (and strip chart record ing) of R.I. changes of sample com ponents as they elute from α liquid column, reaction vessel or still. Refractivp index is one of the most univer sally useful properties ol malriinlq since it affords high measurement sensitivity and is non-destructive to the sample. The versatile 404 is in expensive, accurate, and has a wide measurement range capable of monitorinq darkly colored materials. Send for technical literature today.
NESTER FAUST
SOLVENT -NGN-ION
Specifications Ranges - 1.30 to 1.45 Rl Units 1.45 to 1.60 Rl Units Sensitivity- 0.0005 Rl Units full scale (One mv recorder! Internal Volume--1.1 ml Detector Type Dual differential
I N S T R U M E N T
P R O D U C T S
DIVISION
NFSTER FAUST MFG. CORP. • 2401 OGLFTOWN RO. • NEWARK. D M . 1 9 / 1 ! See ACS Laboratory Guide for All Products/Sales Office 82 A
·
ANALYTICAL CHEMISTRY
Circle No. 2116 on Readers' Service Card
Practical experiments are included to illustrate each analytical technique and these are well selected; questions and problems a t the end of the various chapters also have been well selected and should be very beneficial to the student using this text. The introductory chapter to this book is, I think, poorly geared to the students for whom the text is intended ; it is, for example, quite unnecessary to devote major emphasis (and type space) to a discussion of techniques for measuring mass and volume, in a text intended for advanced students; by the same token such students do not re quire being reminded that "the classical approach to filtration depends on the use of filter paper mounted inside a fil tering funnel" (p. 35) ! The book is overlong. It is inexcusable to include separate chapters on "Acid-Base Titra tions and pH" and on "Acidimetry and Alkalimetry" in this book; much space could be saved by combining these chapters. There is no uniformity of approach in this book; detailed treat ment is given of theoretical aspects of acid-base analysis but essentially no at tention is given to the theoretical as pects of redox procedures. It. is puz zling, to say the least, why the contrib utor of the chapter on "Acidimetry and Alkalimetry" laboriously defines such terms as "titration," "end point," and "equivalent weight" for the relatively advanced students for whom the book is intended. It is also difficult to justi fy the use of space to illustrate a set-u~p for column chromatography on page 431 which is essentially identical to that depicted on page 370. The book seems relatively free of factual errors, but the statement that "ultraviolet radiation is thus seen to fa cilitate transitions between vibrational and rotational energy levels of different electronic levels . .." (p. 432) is unac ceptable; similarly, the representation of the structure of an aldehyde-sodium bisulfite adduct on page 455 is not cor rect. This reviewer found several errors of a typographical and/or grammatical nature in this text. For example, "Whasman" filter papers (footnote p. 53), "Miker" flame (p. 55), "quarternary" ammonium halides (p. 237), a resonance "phenomena" (p. 434). On page 414 the sentence, "Butyro-reading to refractive index conversion tables may be seen in previously mentioned references" is meaningless to this re viewer. On page 323, in the statement " . . . the acetylene procedure can be de termined gasometrically," one should undoubtedly read "production" for "procedure." This book is a mixed bag; with the
