kontes glass company - ACS Publications

bearing, shaft and stirrer blade. Specify capacity of flask to be f. Price, ea. 24/40 ... 57 on Readers' Service Card. 56 A · ... flame tests, heat t...
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You stir without vacuum loss in all normal vacuum distillations,* when you use

Kontes precision-ground stirrers • Shaft-bearing clearances measured in ten-thou­ sandths of an inch. This prevents vacuum loss and makes all Kontes component parts inter­ changeable. • Virtually friction-free ground surfaces; dia­ mond-honed bearings. ι Borosilicate glass used in all parts for added strength and longer life. (Teflon stirrer blades available.) • Convenient lubricant reservoir on bearing top. • Inexpensive adapters permit connecting shafts to motors with chuck openings as small as W, *Ask about special Kontes Stirrers for exceptionally high vacuum appli­ cations.

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Order now for immediate delivery! Write for free copy of Catalog TG-15A describing all Kontes Technical Glassware, including complete line of Stirrers. K - 7 8 1 0 0 , complete with f bearing, shaft and stirrer blade. Specify capacity of flask to be

Τ

24/40 29/42 34/45 45/50

Price, ea 17.85 18.10 18.65 20.30

Above prices dc not include adapter or retainer.

Ash about dollar value discounts!

ods and quantitative cracking and dis­ tilling. A chapter is devoted to carbon black in rubber, another to ashing and analysis of trace metals, and another to analysis of extracts and blooms. Handbook of Chemical Microscopy.

Emile Monnin Chamot and Clyde Walter Mason. 3rd ed. xii + 502 pages. John Wiley & Sons, Inc., 440 Fourth Ave., New York 16, X. Y. 1958. $14.00. This handbook is Vol. I of a two volume series and deals with principles and use of microscopes and accessories. It was not written to present elemen­ tary optics or physical chemistry, but is for the advanced student to present the microscopical techniques and prob­ lems with which chemists must deal. A minimum of necessary theoretical material is included. For biologists the book goes beyond usual sources in many respects. For metallurgists and cera­ mists there are extensive discussions of lumination of opaque objects, particle size, and a real analysis. For the tex­ tile and high polymer chemists, mate­ rial has been introduced on methods of elucidating molecular arrangement by polarized light. Qualitative

Chemical

Analysis.

Bentley and Driver. 5th ed. re­ vised. 48 pages. Oxford University Press, 114 Fifth Ave., New York 11, Ν. Υ. 1958. $1.20. This paper bound volume is divided into four parts. The first deals with general principles and importance of recognition. The second part outlines reactions of cations and groups identi­ fication of different elements into six sections, giving procedures for various elements in each section. Part three discusses reactions of anions and ex­ plains determination of groups such as carbonates, nitrates, sulfates, and many others. The fourth part is classified as systematic qualitative analysis and deals with such subjects as appearance, flame tests, heat tests, separations by groups, and interfering ions. Twentytwo of the pages are blank, for making notes on alternate testing methods. Electronic Apparatus for Biological Research. P. Ε. Κ. Donaldson, xii + 718 pages. Academic Press, Inc., I l l Fifth Ave., New York 3, Ν. Υ. 1958. $20.

KONTES GLASS

COMPANY

Vineland, New Jersey First Choice For Quality Technical Glassware Midwest Distributor: Research Apparatus, Inc., Wauconda, Illinois

Circle No. 57 on Readers' Service Card

56 A

·

ANALYTICAL CHEMISTRY

This handbook is for workers in the biological field who are concerned with the design, construction, and mainte­ nance of electronic equipment. It en­ ables them to understand the basis, and thus the capabilities and limitations, of

the methods available to them. It is divided into four parts. The first part, with 18 chapters, is theoretical. The second part, with nine chapters, is prac­ tical and the third part, also with nine chapters, is concerned with transducers, electrodes, and indicators. The fourth part, in nine chapters, discusses the synthesis of complete electronic units from simpler circuits based on the first part.

Spot

Test

in

Inorganic

Analysis.

Fritz Feigl. Translated by Ralph E. Oesper. 5th ed. xiii + 600 pages. D. Van Nostrand Co. Inc., 120 Alex­ ander St., Princeton, N. J. 1958. $13.25. This publication is for those in­ terested in semimicro and micro meth­ ods of qualitative inorganic analysis, often simple to make, but based on complicated chemical foundations. It contains a considerable number of new tests, the increase being 50 for metals, 24 for acids, and nine for free elements, many of which are published for the first time. Details of operation, inter­ ferences, and limits of detection are given for each test. There are seven chapters. They dis­ cuss development of inorganic spot tests, techniques, tests for metals and métallo acids, tests for acid radicals, tests for free elements, tests for mixtures, and applications of reactions previouslv studied.

Glove Boxes and Shielded Cells for Handling Radioactive Materials.

G. N. Walton, editor, xii 4- 515 pages. Academic Press, Inc., I l l Fifth Ave., New York 3, Ν. Υ. 1958. $16.80. This volume consists of the Proceed­ ings of a s\rmposium held in Cockcroft Hall, A. È. R. E., Harwell, Feb. 19 to 21, 1957, and sponsored by United Kingdom Atomic Energy Authority. It deals mainly with design and operation of equipment developed for the handling of alpha active materials, but some papers are included regarding handling of high beta and gamma sources where shielding of the operator is mandatory. It has two parts, the first dealing with unshielded boxes and the second with shielded cells, and handling and operations are included in each. This book should prove to be a valuable guide in many countries where radiation shielding is not as far advanced as in the countries which furnished the material for the volume.