WILD HEERBRUGG INSTRUMENTS, INC

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<ul><li><p>NEW BOOKS </p><p>WILD * M20 MICROSCOPE </p><p>The one instrument for all research and scientific investigation </p><p>WITH CAMERA 2 Permits continuous bin-ocular observation. Phototube deflects 25% of light to binocular tube. Special format indicating eyepiece provides rapid perfect focusing. WITH CINETUBE-Use with any 16mm movie camera having 50mm or 75mm focal lengths. Focus on specimen during film exposure. Contains two built-in beam splitters, plus a photocell for exposure determination (with galvanometer), and an internal projection tube for titling or designating footage. WITH INCIDENT LIGHT ATTACHMENT - P e r m i t s observation and photomicrography under bright and dark field conditions, with polarization. Optical quality and handling convenience fully comparable to specially designed incident light microscopes. </p><p>WITH DRAWING TUBE - S t ress par t s of a preparation, combine separated details, observe and draw various layers of the object, secure facsimile or enlarged illus-tration of the picture . . . in perfect operator comfort. </p><p>Phase contrast, Varicolor, Universal Lamp, and other accessories are also available for the Wild M-20. </p><p>Can any other microscope offer so much versatility, precision and utility? Your own evaluation of this superb Swiss crafted instrument will provide the answer. </p><p>WRITE FOR BOOKLET M20. </p><p>*The FIRST name in Surveying Instruments, Photogrammetric Equipment and Microscopes. </p><p>WILD H E E R B R U G S </p><p>W I L D HEERBRUGG INSTRUMENTS, INC. PORT WASHINGTON, N E W YORK </p><p>In Canada: Wild of Canada Ltd., 157 Maclaren St., Ottawa, Ontario </p><p>Circle No. 86 on Readers' Service Card </p><p>Full Factory Services </p><p>lation and editing of the present mono-graph, by Peiperl and Wood, have been very well done: only obvious typo-graphical errors have been corrected, in their desire Io present as nearly literal a translation as possible. The reader may therefore be a little sur-prised to find the change in the Gibbs free energy represented by the symbol AZ and equilibrium constants by C. This is not universally the convention in the Russian li terature, however. Errors in the book seem to be compara-tively few; this reviewer noticed only an error in sign affecting the enthalpy and free energy in three equations on p. 222. </p><p>To all scientists and engineers con-cerned with the behavior and properties of molten salts this monograph is well recommended. Tt is an important con-tribution to an area of research that has a long history and an inviting future. </p><p>Analyse der Tenside. Dieter I I inn -mel. Text vo luiiie. ,'32."i pages. Spectra vo urne. 1-7 pages. Carl Hansei Ver lag. Muiiieh. (lermareii. W2. DM the. This set of two volumes covers the </p><p>identification, analysis, and infrared spectra of surface active compounds. A new term "tenside" is used to desig-nate a surface active compound, its origin being traced to the tension in-volved in surface activity. </p><p>The book s tar ts with a brief survey of the development of tensides and their present classification based on the presence or absence of functional groups. The chapter on the determi-nation of electrochemical properties presents both theoretical and experi-mental data and the same approach is followed in the next chapter on the infrared spectroscopy of surface active compounds which covers 107 pages. </p><p>Classical chemical reactions and methods are discussed in the chapters on the determination of structural key points, qualitative, ami quant i ta t ive analyses. Toward the end of the book there is a chapter with l i terature refer-ences which are classified according to their subject mat ter . Twenty table.-, covering 10.'? pages complement this text. </p><p>The spectra volume presents 4(Mi in-frared curves of anionic, cat ionic, non-ionic, and amphoteric tensides and of surface active compounds derived from ethylene oxide adducts, fatty acids, al-cohols, phenols, hydrocarbons, as well as of fluorine-, nitrogen-, and sulfur-containing derivatives. The spectra are pr inted only on the right side of the page and are reduced in size so </p><p>6 8 A . ANALYTICAL CHEMISTRY </p></li></ul>