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  • MARCH 23, 1945 SCIENCE-ADVERTISEMENTS 9

    PHYSIOLOGICAL APPARATUS

    for RESEARCH and TEACHING

    THE INDucToaIum-three-eighths actual size

    Kymographs Recording Levers

    Time Recorders Manometers

    Electrodes Operating Holders

    Keys and Switches Stands and Clamps

    Tambours Inductorium

    Magnetic Signals Respiration Pump

    Parts and Accessories

    Write for the Descriptive Catalogue with Price-List

    The HARVARD APPARATUS COMPANY, Incorporated

    Dover, Massachusetts

    (Organized on a non-profit basis for the advancement ofteaching and investigation in physiology and the allied sciences)

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    MARCia 23, 1945 SCIENCE-ADVERTISEMENTS 9

  • SCIENCE-SUPPLEMENT VOL. 101, No. 2621

    SCIENCE NEWSScience Service, Washington, D. C.

    TELEPHONE WIRE OVER THE GREATSMOKY MOUNTAINS

    AN airplane that looks like one used by commercial air-lines succeeded in laying 16 miles of telephone wire overthe rough, wooded slopes of the Great Smoky Mountainsbetween Tennessee and North Carolina in 61 minutes, areport from the Air Technical Service Command atWright Field reveals. Flying low over elevations between1,500 and 5,000 feet, the wire was laid for use by NationalPark Service rangers.

    The wire-laying project was accomplished last Octoberby a C-47 cargo plane with the aid of the ATSC and theBell Telephone Laboratories. Rangers used the wire forcommunication between Gatlinburg, Tenn., and Smoke-mont, N. C., for five weeks before a sleet storm sheathingthe wire with an inch of ice caused a break." This development by the equipment laboratory of the

    division and the Bell Telephone Laboratories representsan immense saving in time, labor, money and, what ismore important, lives, " declared Brigadier General F. 0.Carroll, chief of the engineering division of the ATSC.

    Setting up standard telephone poles for 16 miles overthe mountainous terrain would have required many menand many days. Applying the method to military opera-tions, a length of wire could be laid over an area open toenemy artillery fire, probably without the loss of a singlelife. It is common in this war to lose many lives estab-lishing even short-distance field communications.

    In operation, the present method of laying wire fromthe air uses eight wooden boxes, each containing twomiles of wire. The wire is boxed and wound so that therewill be no snarls, broken wire, fraying of insulation orother troubles. The wire in each box is spliced to thewire in the next box, so that the unit is actually one longline.From the front end of the lead box extends a long metal

    tube, like the barrel of a big camera lens. To the leadend of the wire is attached a chain and a parachute,which are tossed from the plane's side door over the spotwhere the wire is to be laid.

    Only four men, including pilot and co-pilot, are neededto handle the 16 miles of wire in each plane. There areno special attachments or modifications to the plane.

    In 1942 the idea of laying wire by airplane was pre-sented to the National Development Research Council,which, in collaboration with the Signal Corps, began asix-month project. Although moderately successful, theproject lay dormant until last year.

    ITEMS

    A HUNDRED and thirty billion units of penicillin, orabout 6,500,000 doses, are being supplied to the nation'sdrug stores, hospitals and drug supply houses. By April1, 130,000,000,000 units will be available for civilian useby War Production Board allocation. (From 5,000 to40,000 units are needed in each injection, depending onthe illness.) This is more than three times as much as

    has ever been released for an entire month by WPB 's,civilian penicillin distribution unit in Chicago. For themonth of April, the civilian allocation will be increasedto 150,000,000,000 units. After that, monthly allocationsare expected to be increased each month.

    WARNING that great care should be taken in givingblood transfusions to women with Rh negative blood whohave given birth even as much as 16 years earlier toRh positive babies is given in a report by Dr. LawrenceE. Young and Dr. Donald H. Kariher, of Rochester, N. Y.,in the Journal of the American Medical Association.Some physicians have believed that the antibodies builtup in the mother's bloodstream by the Rh positive infant.which may cause a violent reaction to transfusion withRh positive blood, will disappear in the course of threeor four years. "Sensitivity to the Rh factor," theseinvestigators report, "once it is acquired, may persistfor many years, probably for life." It is recommendedthat nothing but Rh negative blood be transfused into Rhnegative patients regardless of how long it is since theygave birth to an Rh positive baby or of previous historyof transfusions.

    JOHN HEARN, of the Big "O" ranch, reports thatairmen stationed at the AAF Flexible Gunnery Schoolat Laredo, Texas, have found that camouflage suits elimi-nate the need for blinds or concealed spots when duckhunting. Wearing a green and brown camouflage similarto those worn by commandos, marine and other fightersin invasions, gunners can sit on a river bank and fireaway at ducks who even will sit down on the water a few

    feet away. Their camouflage suits cause the huntersto blend into the natural coloring of the spot they havepicked. This does away with the blinds and effectivelyhides them from the eyes of a cautious duck. Camouflagesuits can also be used to stalk deer, hunt coyote, rabbitsand other wildlife. A hunter may have a camouflage suitto blend with every season's coloring and every type ofterrain where he may wish to hunt.

    HEAvY rolling of shoe sole leather, or compression byother means, produces an improvement in wear, it is foundby recent tests made by the National Bureau of Stand-

    ards, in which a regiment of soldiers in an officer candi-date eamp were used, together with some civilian workersin war industries. The tests showed also that differencesin the wearing quality of twenty commercial tannages ofvegetable sole leather were very small, with no significantdifference in the wear of leather tanned from domesticand from cold-storage hides. They showed further thatwater-soluble materials and grease are lost from solesin service, the greatest loss being shown by water-solubleash. The so-called "rubber" abrasive machines are of

    little use in predicting the wearing qualities of tannages.The wearing quality can be estimated, to a degree, by thewater-soluble content, the firmness, and the degree oftannage.

    10

  • MAC 394 C C-DVRi MNT 11

    WILEY BOOKS ror

    GENERAL PHYSICSBy OSWALD H. BLACKWOOD, Professor of Physics, University of Pittsburgh

    A comprehensive textbook for the standard course in general physics for college students. Treatment is simple,yet rigor has been maintained. The absolute system of force units is used in this book rather than the gravita-tional system. The electromagnetic system replaces the International system of electrical units, and the authorintroduces as an alternative the meter-kilogram-second system. The text is amply illustrated, and is supplementedby a large number of problems, grouped according to difficulty.

    630 pages; 51 by .8; 1943; $3.75

    INTRODUCTORY COLLEGE PHYSICSBy OSWALD H. BLACKWOOD

    Intended for a first course in the study of physics, for non-technical students. The book covers the usual groundwith a deliberately restricted and simplified vocabulary and with a great simplification of units. Emphasis is uponreason rather than upon memory. Repetition of fundamental facts and principles fixes them firmly in the student 'smind. A minimum amount of mathematics is used, particularly in the earlier part of the book.

    487 pages; 6 by 9; 1939; $3.50

    COLLEGE PHYSICSBy JOHN A. ELDRIDGE, Professor of Physics, State University of Iowa

    This edition constitutes a thorough revision of an elementary textbook that approaches the subject from the stand-point of everyday. experience. Of special appeal to the physics major as well as to those students whose Ynajorinterest lies in other fields. Previous study of physics is not required. The subject matter is elastic, in that eithera short or long course may be based upon it, depending on curriculum requirements.

    Second edition; 702 pages; 51 by 81; 1940; $3.75

    GENERAL PHYSICS FOR STUDENTS OF SCIENCEBy ROBERT BRucE LINDSAY, Hazard Professor of Physics, Brown University

    This textbook provides the basis for an introductory course for students of science who have had mathematicsthrough elementary calculus. This volume introduces the fundamental concepts of physics in logically rigorousstyle. Special attention is given to the presentation and definition of basic concepts, particularly in mechanics.

    534 pages; 6 by 9; 1940; $3.75

    PHYSICSBy.W. F. G. SWANN, Director, Bartol Research Foundation of the Franklin Institute

    Here is a new approach to the elementary study of physics. The book presents the broad fundamental laws andconcepts of physics, without the technicalities. Basic principles of motion, heat, etc., are first established, thentheir applications in many diverse fields are shown. The style-is clear, interesting and scholarly.274 pages; 5i by 81; 1941; $1.75

    -JOHN WILEY & SONS, Inc., 440-4th Ave., New York 16, N. Y.

    MARci 23, 1945 SCIENCE-ADVERTISEMENTS 11

  • 12 SCIENCE-ADVERTISEMENTS VOL. 101, No. 2621

    1BLAKISrON BOOKSBENSLEY

    Practical Anatomy oF the RabUit-7th EditionBy B. A. BENSLEY, Ph.D., Revised by E. HORNE CRAIGE, Ph.D., University of Toronto.114 Itlus., 358 Pages. Ready Shortly (1945)

    A new section on the sense organs is included, also an account of the essential structure of theliver. A number of illustrations have been changed and 24 entirely new ones added including

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