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  • Researchers!Chemists!Manufacturers!

    Production Men!Teachers!Engineers!

    IENCYCLOPEDIA

    OF

    SUBSTITUTESAND

    SYNTHETICSEDITED BY -MORRIS D. SCHOENGOLD WITH THECOLLABORATION OF AMERICA'S FOREMOSTCHEMICAL AND INDUSTRIAL LABORATORIES

    THIS AUTHORITATIVE WORK HELPS YOU KEEP PACE WITH PROGRESS IN SYNTHETICSThe First Book of Its Kind In Any Languagel ... Here Are a Few of the Many Organizations thatHelped Make This Volume Possible: American Cyanamid Co. * American Iron & Steel Institute -Armstrong Cork Corp. * Bakelite Corp. * Borden Co. * Colgate-Palmolive-Peet Co. * Commercial SolventsCorp. * Dow Chemical Co. * E. I. Du Pont de Nemours & Co. * Eastman Kodak Co. * General ElectricCo. * B. F. Goodrich Co. * Hercules Powder Co. * Monsanto Chemical Co. * Pittsburgh Plate Glass Co. -Union Carbide & Carbon Corp. * U. S. Rubber Co.

    READ WHAT THESE LtADING JOURNALS SAY:"An invaluable reference book covering products easy reference."-Southern Power and Industry

    which have been recently developed to replacecritical materials difficult or impossible to obtain. To the chemist this encyclopedia of raw ma-It discusses substitutes of interest to all branches terials, chemicals, processes, substitutes andof industry..... and plastics and other synthetics ............synthetics, will prove extremely useful .................This,which for years have been replacing many of the the first compendium of its kind, shows that 'sub-commonly known applications of metal." stitutes' often are superior to the materials

    -Chemical and EngineeringNews replaced." -Scientific Monthly"This unique encyclopedia presents invaluable"A first rate job based on firsthand information information that is not available even in the best

    ... not mere listings, but the whole story: Proper- libraries without thorough time-consumingties, Solubility, Substitutes, Uses, Processes. In searches through the literature...."these days of unforeseen difficulties and new -Journal of American Medical Associationproblems, no chemist, research man or planning "This encyclopedia should prove useful to in-manufacturer should be without it. We recom- dustrial and laboratory chemists who are in searchmend it highly... ." -Science Illustrated of new and improved materials.""This new and unusual book lists thousands -Science News Letter

    of raw materials, chemicals, processes, substi- ". . The book facilitates rapid decisions ..."stitutes, synthetics, all in alphabetical order for -General Electric Review

    TELLS WHAT YOU WANT TO KNOW ABOUT-Abrasives * Absorbents * Acetylene * Adhesives * Antise tics * Baking Powders * Bleaching Agents * Bristles * Burlap * Butane .Calcium Lights * Candles * Castor Oil * Catalysts * Celluloid * Cellulose Acetate * Cement * Ceramics * Cheese * Chewing Gum .Cinnamic Acid * Cleansers * Coatings * Concrete * Confectionery * Conveyor Belts * Copper * Cosmetics * Dehydrating Agents .Dentifrices * Disinfectants * Drugs * Drying Agents * Drying Oils * Dyes * Egg White * Electroplating * Emulsifying Agents .Enamel Ware * Enamels * Ester Gum * Explosives * Fertilizer * Fillers * Fire Extinguishers * Fireproofing * Flameproofing .Flatting Agents * Flavors * Floorings * Foaming Agents * Fumigants * Fungicides * Furs * Gaskets * Gelatin * Germicides -Gladiolus Thrips * Glass * Glazes *Gum Inhibitor * Gums * Herbicide * Horn (Artificial) * Horsehair * Humectants * Hydrogen Peroxide.Hygroscopic Agents * Ice Cream * Impregnants * Inks * Insecticides * Insulators * Iron * Jewelry * Kalsomine * Lacquers * Latex .Lead Alloys * Leather * Lenses * Linoleum * Lotions * Lubricants * Magnesium * Matches * Methyl Amine * Methyl Cyanide * Mica .Mordant * Mortar * Mothproofing * Mounting Medium * Musk * Nitrocellulose * Nitrocellulose Lacquers * Nutrients * Odorants *Ointments * Opacifiers * Paint Driers * Paints * Paper * Parchment * Patent Leather * Pattern Plates * Perfumes * Pestles * Pewter .Phonograph Records * Photography * Piccolyte Resins * Plasters * Plasticizers * Plywood * Polishes * Preservatives * Putty * Pyrotechnics .Refrigerants * Resins * Rock Wool * Roofing Material * Rope * Rosin * Rubber * Rubber, Synthetic * Saftey Glass * Sealing Wax .Shellac * Shoe Polishes * Silica Gel * Silica Glass * Smelling Salts * Smokeless Powders * Soap * Solders * Storage Batteries * SulfuricAcid * Tannic Acid * Tanstuffs * Textile Dyeing * Textile Printing * Textile Sizing * Textiles * Tin Stamping * Tobacco * Type Metal .Varnish * Varnish Driers * Vibration Absorber * Washing Machines * Water * Waterproofing * Weather Stripping * Wetting Agents .Whitewash * Wood Impregnant * Wool * Yeast * Zinc, etc.

    $10.00LIMITED EDITIONORDER WITHOUT.

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    Mail Coupon promptlyPHILOSOPHICAL LIBRARY, Publishers15 East 40th Street, Dept. Z, New York 16, N. Y.Please send me.......copies of the ENCYCLOPEDIA OF SUBSTITUTESAND SYNTHETICS, at $10.00 per copy. Enclosed are$.NAME

    ADDRESS

    CITY STATE_ I9

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  • Years ago Alexander Graham Bell dreamedof "a machine that should render visible tothe eyes of the deaf, the vibrations of theair that affect our ears as sound." He neverrealized that dream, but his researches ledto the invention of the telephone. 4

    Today Bell Telephone Laboratories haveturned the dream into a fact-translatingthe spoken word into readable pictures.By this new invention of the Laborato-

    ries, the talker speaks into a microphone.Vibrations of the voice are unraveledthrough electronic circuits, and then arereassembled as luminous patterns whichtravel across a screen. Each syllable ofsound has a distinctive shape and intensity.

    Visible speech is still in its infancy, andis not yet available to the public. But edu-cators of the deaf are now evaluating it.

    S I E N S U N R A V U L S S P EET S%

    Science unravels speechIndications are that the deaf can learn toread the patterns and, by comparing thepatterns their own voices make with thepatterns of correct speech, can improvetheir diction.

    Patterns of visible speech also providea means for analyzing and recording soundin the study of phonetics and of languages.Eventually, visible speech may make pos-sible visual telephony for the deaf.

    This is but one of many contributions'by Bell Telephone Laboratories to the un-derstanding and control of sound.

    h BELL TELEPHONE LABORATORIES Exploring and Inventing, Devisingand Perfecting for Continued Improvements and Economies in Telephone Service

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    THE CHEMISTRY and PHYSICS of ORGANIC PIGMENTSBy LYDE S. PRATT, Technical Consultant, Organic Pigment Department, CalcoChemical Division, American Cyanamid Company.

    An authoritative analysis of the chemistry and physics of organic pigments, and the dyestuffs orcolors from which they are derived. Among the topics discussed are: theoretical considerations ofthe relation between color, and chemical and physical structure; the raw materials for syntheticorganic pigments; methods of testing known and unknown pigments; and analytical procedures andidentification. Ready in June.

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    UNIFIED CALCULUSBy EDWARD S. SMITH, Professor of Mathematics; MEYER SALKOVER, Associate Pro-fessor of Mathematics; and HOWARD K. JUSTICE, Professor of Mathematics; all atthe University of Cincinnati.

    A refreshing, thorough, and penetrating approach to calculus, stressing the interrelationship of thevarious phases of the subject. Some distinguishing features of this unique book are: greater stresson differentials-the connecting link between differentiation and integration; use of the concept ofspeed to motivate rate of change; material on mean value by integration; and extensive treatment ofproducts of inertia, and the adoption of right-handed space axes. Ready in April.

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    RUSSIAN-ENGLISH TECHNICAL and CHEMICAL DICTIONARYBy LUDMILLA IGNATIEV CALLAHAM, Technical Translator.

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    17

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  • Personnel Placement

    CHARGES FOR CLASSIFIED ADVERTISINGRegular setting 10aa word. Minimum charge $250 for each ier-tion. A box number counts as 3 words of the advertisem t (eg. 25words plus box number equals 33 words). Make checks payableto the A.A.A.S. All insertions must be accommied by correctremittance and sent to the Adv. Dept. A.A.AS. Please addressreplies as follows: Box number, ScOxzcE, 1515 Mass. Ave., N.W.,Washington 5, D. C.

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    Anatomist. who has served as professor and head of department of anatomyin university medical school for the past 12 years, is available; is especiallyinterested in position involving gross and neuro anatomy; AB,AM, MDdegrees, leading universities; for further information please write BurneiceLarson, Director, Medical Bureau, Palmolive Building, Chicago ":

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    9-H

    with the

    Sencer Refract Qmeter

    Quick, critically accurate determinations of refractliveindex and dispersion are easily accomplished withiSpencer' Refractometers. In manv industries thesedeterminations are a convenient basis for control ofquiality. Food, petroleum, chemical, rubber, distilling,pharmtaiceutical, optical, and manv other industriesfind its use of great value.One of the six types of Spencer Refractometers mayanswer a real need in your research or production de-partments. For additional information write Dept. P4.

    Amnerican Optical'COMPANY

    Scientific Instrument DivisionBuffalo 15, New York