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Consolidated Engineering Corporation ELECTRONIC I N S T R U M E N T S F O R M E A S U R E M E N T A N D C O N T R O L 300 North Sierra Madre Villa, Pasadena 15, California Sales and Service Offices Located in: Albuquerque, Dallms, Detroit, New York, Pasadena, Philadelphia, Fer further infirm at ion,
Atlanta, Buffalo, Chicago, Seattle, Washington, D. C.
circle number 38 A-1 on Readers' Service Card, page 51 A
TWO Balances in ONE! Dual Sensitivity Device makes the Voland Universal Balance equivalent to two separate instruments
Ξ 1.
A n analytical balance of moderate sensitivity but high accuracy, reading directly t o 1 / 1 Oth milligrams with a capacity of 2 0 0 grams.
2.
A superb high-precision research bal ance of uneoualed stability, reading directly to 1/100th milligram.
VOLAND BALANCE S P E E D — w e i g h i n g s i n seconds are made possible b y an o p t i c a l system a n d b u i l t - i n w e i g h t s , w h i c h eliminate t h e need f o r any outside w e i g h t s . Readings are all d i r e c t . A C C U R A C Y — o f 0 . 0 5 millisram is o b t a i n a b l e t h r o u g h t h e use o f a unique beam system w h i c h includes w e d g e - l o c k e d knives and compensating stirrups, plus a r i g i d o p t i c a l system. V E R S A T I L I T Y — t h e u n e q u a l l e d advantage o f having o n e instru ment c o m b i n i n g t h e purposes o f t w o — a n analytical balance plus a high p r e c i s i o n research balance. E C O N O M Y — a l l these features c o m b i n e t o make t h e V o l a n d Universal Balance t h e most e c o n o m i c a l balance f o r analytical weighing. It saves time, reduces o p e r a t o r cost a n d o p e r a t o r training—eliminates laborious w e i g h i n g computations, reduces errors. By c o m b i n i n g t w o balances i n o n e i t cuts capital o u t l a y .
S T A N D A R D
S C I E N T I F I C
3 4 West 4 t h S t r e e t
Cat. No. 14130 00
*895.
S U P P L Y
C O R P .
New York 12, Ν. Υ.
Fer further information, circle number 38 A-2 on Readers' Service Card, page 51 A
38 A
irreversible, kinetic, and catalytic proc esses; also with continuously changing and periodically changing potential, and at controlled current. Current-poten tial curves obtained in stirred solutions or with moving electrodes and voltammetric titrations are also theoretically treated. The quality of this section is best stated by I. M. Kolthoff in his brief foreword to the book, "The theory in Part I is the most authoritative, systematic, original, and exhaustive treatment to be found in the literature." The principles of the various coulometric and electrolytic methods are presented in Part II in a concise and easily understandable manner, so the reader can review the main points of these important electroanalytical pro cedures in an hour or two of concen trated reading. Charles N. Reilley wrote Part III, a short section on high frequency methods, and it is the best book presentation to date of the basic principles of these techniques. Instrumentation in voltammetry, coulometry, controlled potential elec trolysis, etc., is discussed in Part IV. Only basic schematic diagrams illustrat ing the general methods of measure ment are presented and the original literature references are given for specific types of instruments. It is the re viewer's opinion that the schematic representations as given in Part IV are more appropriate and effective than specific circuits in the elementary teach ing of instrumental methods of chemical analysis, contrary to most textbooks on the subject. Instructors and students of instrumental courses should profit by reading Delahay's simple descriptions of the instrumentation for the electro chemical methods presented in the first three parts. In summary, this book is very much worth while to anyone who desires to understand the fundamentals of the newer electrochemical methods, so that a more systematic and intelligent ap proach can be made to obtain analytical or physicochemical information. It is an ideal reference book for students and instructors of courses including these subjects. Although only a relatively few specific analytical applications are mentioned, this is not particularly unde sirable in a book stressing fundamentals. Non-Aqueous Titration. SantiR. Palit, Mihir N. Das, and G. R. Somayajulu. 121 pages. Indian Association for the Cultivation of Science, Calcutta 32, India, 1954. $1.00. Survey of recently developed methods of acid-base titrations in nonaqueous solvents. Main theme is the glycolic titration method which was discovered by the senior author. ANALYTICAL
CHEMISTRY
