Front Matter Source: The Scientific Monthly, Vol. 29, No. 4 (Oct., 1929), pp. i-viii Published by: American Association for the Advancement of Science Stable URL: http://www.jstor.org/stable/14625 . Accessed: 08/05/2014 08:39 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp . JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. . American Association for the Advancement of Science is collaborating with JSTOR to digitize, preserve and extend access to The Scientific Monthly. http://www.jstor.org This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AM All use subject to JSTOR Terms and Conditions
Transcript
Front MatterSource: The Scientific Monthly, Vol. 29, No. 4 (Oct., 1929), pp. i-viiiPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/14625 .
Accessed: 08/05/2014 08:39
Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at .http://www.jstor.org/page/info/about/policies/terms.jsp
.JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range ofcontent in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new formsof scholarship. For more information about JSTOR, please contact [email protected].
.
American Association for the Advancement of Science is collaborating with JSTOR to digitize, preserve andextend access to The Scientific Monthly.
http://www.jstor.org
This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AMAll use subject to JSTOR Terms and Conditions
THE SCIENCE OF ICE ENGINEERING. PROFESSOR HOWARD T. BARNES ............. . ................................................ 289
THE HOPKINS MARINEI STATION OF STANFORD UNIVER- SITY. DR. W. K. FISiHER ............................................................ 298
THE DEVELOPMENT OF AGRICULTURE. DR. WALTER HOUGH ......... 304
W HAT IS EVOLUTION? GE6oRGE J. DuDYCHA ......................................................... 317
REMINISCENCES OF AN AMATEUR BOTANIST. PROFESSOR FREDERIC T. BIOLETTI ................ . 333
THE MUSEUM OF SCIENCE AND ITS RELATION TO IN- DUSTRY. DR. F. C. BiRoWN ........................................................... 340
FITTING THE COLLEGE TO YOUR BOY AND GIRL. DR. ALBERT
EDWARD WIGGAM ............................................................ 349
THE BIRTHPLACE OF MAN. DR. GEORGE S. DUNCAN .................................... 359
THE PEACEFUL PENETRATION OF ATOMISM. DR. EixP J. WITZEMANN ............................................................. 363
THE CHEMISTRY OF THE FORMATION OF POISONS IN PLANTS. LIEUTENANT ROBERT E. SADTLR ........................................................... 369
STUDENT HEALTH SERVICES AND MODERN MEDICINE. DR. J. Ho-wARD BEARD ............................................................ 371
THE PROGRESS OF SCIENCE: The Thirteenth International Physiological Congress at Harvard University; The Ninth International Congress of Psychology at Yale University ............................................................. 375
THE SCIENCE PRESS LANCASTER, PA.-GRAND CENTRAL TERMINAL, N. Y. CITY-GARRISON, N. Y.
Yearly Subscription $5.00 Single Copies 50 cents
This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AMAll use subject to JSTOR Terms and Conditions
NEW BOOKS OF SCIENTIFIC INTEREST A Course in General Mathematics. CLINTON H.
CuRRiEB and EMERY E. WATSON. viii + 413 pp. $3.50. Macmillan Company.
This book includes the elements of algebra, trigo- nometry, analytic geometry and calcullus. It presup- poses oni the part of the student only the minimum college entrance requirements in elementary algebra and plane geometry.
The Airplane and Its Engine. CHARLES H. CHAT-
FIELD and CHARLES F. TAYLOR. vii + 329 pp. Illus- trated. $2.50. McGraw-Hill Book Company.
This volume is intended primarily for persons in- terested in acquiring a sound knowledge of the basic facts and theories of the airplane who still do not desire to give to the subject the intensive study which is essential for the designing engineer or the expert mechanic.
The Book of the Aeroplane. CAPTAIN J. LAW- RENCE PRITCHARD. Second edition. vii + 267 pp. 24 plates. $3.00. Loigmans, Green and Company.
This book, first published in October, 1926, at- tempts to tell the story of the aeroplane in all its aspects. To the present edition the author has added a niew chapter oni developments in aviation since the pulblication of the first edition.
Chemistry in Daily Life. SAMUEL GLASSTONE. vi + 250 pp. 21 diagrams. $2.25. E. P. Dutton and Company.
It is hoped that this book will be of interest to the general reader and be useful as a basis for extension, and similar lectures for adults, as well as a text- book for schools, whether chemistry is taught or not.
Origin through Evolution. NATHAN FASTEN. xiii + 456 pp. 75 illustrations. $4.00. Alfred A. Knopf.
The present treatise is an attempt to presenit the facts of evolution as the scientist sees them, in a manner which can be understood not alone by the trained student, but also by the fair-minided and truth-seeking layman.
New Views of Evolution. G. P. CONGER. ix + 235
pp. $2.50. Macmillan Company.
The author believes that, in spite of many hanidi- caps, we may " take as an initial assumption the view that the world in at least its broad outlines can be understood if we try to understanid it."
Manual of the Vertebrate Animals of the North- eastern United States Inclusive of Marine Species. DAVID STARR JORDAN. Thirteenth edi- tion. xxxi + 446 pp. Illustrated. $4.00. World Book Company.
After going through twelve editions this work has now been given a thorough revision and new features have been added. The author has tried to make use of all information available in bringing nomenclature and descriptions up to date.
Some American Medical Botanists. Commemo- rated in our Botanical Nomenclature. HOWARD A. KELLY. 215 pp. 43 illustrations. $3.50. D. Appleton and Company.
The author of this book, first privately printed In 1914, has written interesting biographical sketches of the most outstanding of the early medical botanists, who came to America during the seventeenth, eight- eenth and niineteenth centuries.
The Plant in Relation to Water. A study of the physiological basis of drought resistance. N. A. MAXIMOV. Translated into English by R. H. Yapp. 451 pp. 46 figures. $6.50. Macmillan Company.
This volume contains a balanced summary and dis- cussion of the many important recent advances in this branch of botany, which, in addition to its scien- tific interest, is of fundamental importance in its ap- plication to agriculture.
The Science of Psychology. An introductory study. RAYMOND HOLDER WHEELER. xvii + 556 pp. 68 illustrations. $3.75. Thomas Y. Crowell Coompany.
The author gives us here an entirely new work based upon laboratory analysis and experimental in,- vestigation. Written from the organismic and con- figurational standpoints, it reorganizes and supple- ments the material of older books.
The Thinking Machine. C. JUDSON HEaRICK.
xii + 374 pp. $3.00. University of Chicago Press.
Tlhinkinig, Dr. Herrick believes, is as natural a bio- logical process as the contraction of muscles; they are the work of a machine in both cases. If we learn how we think, we may control and improve both the process and the output.
Human Nature and Management. ORDWAY
TREAD. x + 312 pp. McGraw-Hill Book Company.
This book supplies executives and studenits with a readable but accurate statement of how the findings of modern psychology can be applied in managerial work of all kinds.
Outlines of Preventive Medicine. For medical practitioners and students. Prepared under the auspices of the Committee on Public Health Rela- tions, New York Academy of Medicine. Twenty- one contributors. Editorial Committee: FREDERIC E. SONDERN, CHAS. GORDON HEYD and E. H. L. CORWIN. xvii + 398 pp. $5.00. Paul B. Hoeber.
Each contributor to this volume has written of the ways in which his specialty is related to preventive medicine.
Black Roadways. A study of folk life in Jamaica. MARTHA WARREN BECKWITH. xvii + 243 pp. 22 illustrations. $3.00. University of North Carolina Press.
In addition to other considerations, the fact that Jamaica Negroes have not received their due share of attention in folk-lore studies makes this book all the more interesting to students of folk background.
This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AMAll use subject to JSTOR Terms and Conditions
International Revilew of the History of Scien.ce and Civilization
Quarterly Organ of the History of Science Society
Isis was founded in Belgium in 1913. It is published mainly in English but contains contributions in French, German, Italian and Latin. It is strictly international, giving no privileged position to any country. Its main lanrguage, English, is lnot the language of one single nation, but of many: England and Scotland, the United States, Ireland, Canada, South Af-rica, Australia, New Zealand, etc. Thus the use of English rather than other languages implies no national propaganda.
Isis is the official organ of a free society of scholars, The History of Science Society. It is not supported by any institution or by any government.
It is devoted exclusively to the search and publication of truth within its own field, the History and Philosophy of Science, and to the diffusion of the New Humanism, i.e., the reconciliation of the human- istic and scientific ideals, the preparation of a New Renaissance, wherein Science will be considered an integral part of culture, even as literature, art and religion.
The following statistics will give an idea of the amount of material published in Isis. The first eight volumes (1913-1926) contain 130 original memoirs, 203 shorter notes, 528 reviews, 14025 bibliographical notes, 5236 pages, 47 plates. Thus the average volume contains 16 memoirs, 26 shorter notes, 66 reviews, 1753 bibliographical notes, 656 pages, 6 plates (the number of plates is much larger in the latest vol- umes). The smallest volume ever published (vol. 2, 1914-19) con- tains 487 pages.
Isis is edited by George Sarton, D.Se., Associate of the Carnegie Institution of Washington (Harvard Library 185, Cambridge 38, Mass., U. S. A.).
Page Contributed with (Compliments of Medical Life Press
This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AMAll use subject to JSTOR Terms and Conditions
The Scientific Monthly An Illustrated Magazine Devoted to the Diffusion of Science
J. McKEEN CATTELL, Editor WARE CATTELL, Associate Editor
Published by THE SCIENCE PRESS LANCASTER, PA.-NEW YORK, N. Y., Grand Central Terminal-GARRISON, N. Y.
Single Number, 50 Cents Yearly Subscription, $5.oo COPYRIGHT 1929 BY THE SCIENCE PRESS
Entered as second-class matter at the post office at Lancaster, Pa., July 18, 1923, under the Act of March 3, 1879.
New Impression Now Ready
The Foundations of Science By H. POINCARE
Pp. xi+ 553
Containing the authorized English translation by George Bruee Halsted of "Science and Hypothesis," " The Value of Science " and " Science and Method, " with a special preface by Poincare', and an introduction by Josiah Royce. Price, postpaid, $5.00.
THE SCIENCE PRESS Grand Central Terminal New York, N. Y.
RECENT BOOKS OF SCIENTIFIC INTEREST Physician and Patient. Edited by L. EuGEaX EMEmSON. 244 pp. $2.50. Harvard University Press.
This book is intended for all who are interested in medicine; physicians, nurses, students and all ,who have ever been sick, ever will be sick, or have anything to do with the sick. It emphasizes the ,view that not alone the patient's body but also his mind should be cared for by the physician.
The Theory of the Gene. Revised Edition. THOMAS HUNT MORGAN. 358 pp. Illustrated. $4.00. Yale University Press.
A revised and enlarged edition of the volume first
published in 1926. The American Library Associa-
tion selected the first edition as one of the forty most notable American publications of that year.
Growth. SAMvuE BRODY, ALBERT GARLAND HOGAN, CLAR?NCn MARTIN JACKSON, CHARLES WILSON GREENE. 189 pp. Illustrated. $3.00. Yale Uni- versity Press.
Essays on the biological principles of growth, in- cluding " An Analysis of the Course of Growth and Senescence," " Relations between Growth and Nutri- tion," "Aspects of Form and Growth" and " Physi- ological Abnormalities of Growth."
Blood: A Study in General Physiology. LAW- RENCE J. HENDERSON. 397 pp. Illustrated with tables and diagrams. $5.00. Yale University Press.
A volume based on the Silliman Lectures delivered at Yale University with the addition of such material as seemed necessary to make the work methodical and useful. The subject is the red blood of verte- brates.
The Anatomy and Physiology of Capillaries. Revised Edition. AUGUST KROGH. 445 pp. Illus- trated. $4.00. Yale University Press.
A revised edition of the earlier volume based on the Silliman Lectures delivered at Yale University in 1922. This edition is expanded and includes the re- sults of subsequent research.
A Guide to the Winter Birds of the North Carolina Sandhil1s. MILTON P. SKINNER and JOHN WARREN ACIHORN. 295 pp. $4.00. Science Press.
A book primarily for people who are, or may wish to become, interested in birds rather than for scien- tists. Technical terms are avoided so far as pos- sible, but care has been taken to make every state- ment scientifically accurate.
This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AMAll use subject to JSTOR Terms and Conditions
ENCYCLOP]EDIA BRITANNI CA N EW in plan and purpose-enttirely
recast from cover to cover-the new Fourteenth Edition of the Encyclo-
paedia Britannica is ready.This is the suLperb "humanized" Britannica which has captured the attention of the whole civilized vworld.
Three years of intensive effort-the co- operation of 3,500 of the world's foremost authorities-the expenditure of more than $2,000,000 before a single volume was printed-these are merely a few high lights in the preparation of the new Edition.
Last Word in Encyclopaedia Perfection Thisq neurw Britannica immediately takesq its place as the one pre-eminent American work of reference- the last word in encyclopaedia perfection.
Never has there been assem- bled together in one enterprise such a wealth of learning. All the universities, all the learned professions, all the great in- dustries, all the pastimes have contributed to the mighty sum.
Knowledge For All It is a law library for the lawyer, a medical digest for the doctor, a universal history for the historian, a commercial uni- versity for the business man- and a compendium of all the arts and sciences for the aver- age reader. Here is "the cos- mos between covers."
Nothing is too profound to baffle it, and nothing too famil- iar to escape its informing touch. And on every subject it speaks with the same finality and authority.
All the World's Treasures of Art and Illustration
Among the many new features that will astonish and delight everyone
This handsome bookcase table, made of genuine Brown Mahog- any, is included with every set
of the new Britannica.
Noote these facts
Cost More Than $2,000,000 Over 15,000
Sulperb Illustrations Greatest Knowledge BoDk Ever Produced Written by 3,500 of the World's Most Eminent Authorities Remember -this is a new book. Only a small amount of text - material which could not be improved in any way- has been retained from pre-
vious editions.
who turns these pages is the wealth and beauty of the illustrations. This feature alone marks a tre- mendouts advance. All the world's treasures of art and photography
tribute to adorn and illuminate the text.
"The most excit- ing bookc of 1929," as- serts a leading critic, and the whole world is echoing that verdict.
This is a Britannica year! Here is your opportunity to join the thou- sands who will buy this new edition, now, while it is new-fresh from the presses. You owe it to yourself to learn further details regarding this magnificent series of volumes.
Extremely Low Price And due to the economies of mass production, the price is extremely low. Easy payments, if desired- a deposit of only $5 brings the com- plete set with bookcase table to your home.
Send for FREE Booklet We have just prepared a handsome new 56- page booklet containing numerous color-plates, maps, etc., from the new edition and giving full information about it. We want you to have a copy free.
The demand is great- you should act promptly if you are interested in owning a set of the first printing on the present favorable terms. Just fill in the handy coupon and mail it today.
- - - m - - - m - - - -- I ENCYCLOPAEDIA BRITANNICA, INC. I I 342 Madison Avenue, New York City ScM9-Al Please send me by return mail,without any
Iobligation on my part, your 56-page illustrated booklet describing the new Fourteenth Edition I of the Britannica together with full informa- tion concerning bindings, low price offer, etc.
Name |
Address I LCity Statfe - LCt_______________ Stt________ MAIL this Coupon l'ODAY
This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AMAll use subject to JSTOR Terms and Conditions
OCEANOGRAPHY Two significant studies from the Scripps Institution of Oceanography of the University of California at La Jolla, California. .. . . .
By GEORGE FRANCIS McEWEN Professor of Physical Oceanography
Methods of Estimating the Significance of Differences or Probabilities of Fluctuations Due to Random Sampling.
Numerical Illustrations, Formulae, and Tables Prepared Especially for Estimating Probabilities when the Usual "Method of Least Squares" or "Normal Law of Error" may not apply.
137 pages. Price $1.70 postpaid
A Mathematical Theory of the Vertical Distribution of Temperature and Salinity in Water under the action of Radiation, Conduction, Evaporation, and
Mixing Due to the Resulting Convection. Derivation of a General Theory, and Illustrative Numerical Applicatiolns to a Tank, a Lake, and a Region of the North Pacific Ocean.
Ill#strated. Price $1.25 postpaid
University of California Press Berkeley, California
Publishers: G. E. STECHERT & CO., New York-DAVID NUTT, London-FELIX ALCAN, Paris- ARAD. VERLAGSGESELLSCHAFT, Leipzig-NICOLA ZANICHELLI, Bologna-RIJIZ HER- MANOS, Madrid-RENASCENCA PORTUGUESA, Porto-THE MARUZEN COMPANY, Tokyo
INTERNATIONAL REVIEW OF SCIENTIFIC SYNTHESIS Published every ronth (each number containing 100 to 120
1111 ~~~~~~~pages) Editor: EUGENIO RIGNANO IS THE ONLY REVIEW the contributors to which are really international. IS THE ONLY REVIEW that has a really world-wide circulation. IS THIE ONLY REVIEW of scientific synthesis and unification that deals with the funda-
mental questions of all sciences: the history of the sciences, mathematics, astronomy, geology, physics, chemistry, biology, psychology and sociology.
IS THE ONLY REVIEW therefore which, while immediately interesting students of mathematics, astronomy, astrophysics and physics, by its numerous and important articles and reports relating to these sciences, presents them also the means of knowing, in a summary and synthetic form, the chief problems of all the other branches of knowledge.
IS THE ONLY REVIEW that among its contributors can boast of the most illustrious men of science in the whole world. A list of more than 350 of these is given in each number.
The articles are published in the language of their author, and every number has a su&pple- inent containing the French translation of all the articles that are not French. The review is thus completely accessible to those who know only French. (Write for a free Copy to the General Secretary of "Scientia," Milan, sending 12 cents in stamps of your coun- try, merely to cover packing and postage.)
SUBSCRIPTION: $10, post free OFFICE: Via A. De Togni Milan (116) General Secretary: DR. PAOLO BONETTI
This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AMAll use subject to JSTOR Terms and Conditions
One of the Great Classics of Science "THE FIRST profCound study of the genesis of the intimate
or internal strueture of the human brain in comparison with the brains of animals more or less nearly related to man. . . ." X--HENRY FAIRFIELD OSBORN.
THE BRAIN FROM APE TO MAN A Contribution to tze Study of the Ev/olution
and Development of the Human Brain BY
FRED)ERICK TILNEY, M.D. Professor of Neutrology, Columbia University, New Yorkh
WIT-I A FORFWORD BY
HENRY FAIRFIELD OSBORN Research Professor of Zoology, Columbia University, New York
ACCLAIMED as the most important contribution to the subject of Evotution since Darwin, Professor Tilney 's
monumental work now receives further recognition as ONE OF THE FouR NOTABLE AM ERICAN BOOKS Of 1928, in the field of Natural Science.
Selected by the AMERICAN LIBRARY ASSOCIATION for the International Institute of Intellectual Cooperation of the League of Nations, for inclusion in a World List of Notable Books.
TWO LARGE VOLUMES (8 x 10% inches) CONTAINING OVER 900 PAGES -AND 00 ILLUSTRATIONS, OF WHICH 35 ARE COLORED
HANDSOMELY BOUND IN CLOTH & NEATLY BOXED), $25.00 NET DELIVERED
(Descriptive Circular Sent on Reqitest)
PAUL B. HOEBER INC. PUBLISHERS 76 FIFTH AVENUE NEW YORK
Publishers of The American Jouraal of Surgery; The American Journal of Roentgenol- ogy and Radium Therapy; Annals of Me'dicat History; Annals of Boentgenology, etc.
This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AMAll use subject to JSTOR Terms and Conditions
Written by THOMAS NORTON of "Bristoll" in the 15th century and reproduced in facsimile, with seven excellent woodeuts. Appropriately bound in marbled art boards. Its quaintness and delicious naivete makes delightful reading; its char- acter makes it an acquisition to the library. $2.50.
The Most Nearly Perfect Food
By SAMUEL J. CRUMBINE and JAMES A. TOBEY. Every book on dietetics emphasizes the value of milk; but not hitherto has the whole story of milk been told-its history, its role in healthful diet and longev- ity, its manifold uses. The volume is well illustrated, and of use and in- terest to anyone who eats. $2.50.
The Doctor in Court
By EDWARD HUNTINGTON WIL- LIAMS, who has had a long and varied experience as an " expert witness. " The form is largely that of a series of entertaining stories of criminal prac- tice and procedure, culled from some of the most famous trials of the past quarter century, and of the part the "expert" plays. Highly diverting, often amusing, the book gives a view of the court from an unusual angle. $3.00.
Order these new books from
The Williams & Wilkins Company, Baltimore, U. S. A. Publisher-s of Scientific Books and Periodicals
The New York Academy of Sciences Important Announcement The A. Cressy Morrison Prizes for
1929 and 1930O
The New York Academy of Sciences an- nounces three prizes offered by Mr. A. Cressy Morrison, to be known as the A. Cressy Morrison Prizes I, II, III. Prize I, of $750, will be awarded in December, 1930, for the best paper on the source of solar and stellar eniergy, utilizing the fol- lowing subject:
"WI hat may be proved from our present knowledge as to t;he possibility or impos- sibility of released intra-atomic energy constituting an important source of solar or stellar energy."
Prize II will be awarded in December, 1929, for the best paper on a subject in the field of experimental biology.
Prize III will be awarded in December, 1929, for the best paper on a scientific sub- ject included within a field covered by the various sections of the New York Acad- emy of Sciences and Affiliated Societies, but not covered by the first two prizes.
The competition for Prize I is open to all. Prizes II and III are limited to mem- bers of the New York Academy of Sciences and Affiliated Societies, but non-members may become eligible by joining one of these organizations before the closing date.
All competing papers for Prizes II and III must be in, the hands of the Recording Secretary on or before November 1, 1929. Those for Prize I must be presented on or before November 1, 1930. Details con- cerning the conditions of the competition may be secured by addressing the under- signed.
Roy Waldo Miner Recording Secretary
The New York Academy of Sciences, 77th Street and Central Park West,
New York City.
This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AMAll use subject to JSTOR Terms and Conditions
GEORGE R. LARUJE and ALEXANDER G. RUTHVEN of the University of Michigan
McGraw-Hill Pnblications in the Zoological Sciences $3.50
N this new edition the authors reaffirm their conviction that the best .l||j 1approach to biological science is through the presentation of great general-
izations and fundamental principles. The intimate relation between function and structure is emphasized by com-
bining the chapters on morphology and physiology of higher types. The combined discussion is divided into several chapters in recognition of distinct types of physiological processes.
The account of cell structure and cell physiology has been rewritten to em- phasize still more strongly the fundamental features, and to include some of the most recent conclusions of the general physiologists.
The chapter on Genetics lhas been strengthened by the inclusion of an ade- quate account of linkage and sex-linkage, by revision of the problems and by the inclusion of additional problenms.
The entire book has been thoroughly revised to reflect new discoveries and altered points of view.
Shull's PRINCIPLES OF ANIMAL BIOLOGY has been widely used in previous editions. In fact this past year it has been in use in 87 colleges.
A revision of Shull's LABORATORY DIRECTIONS IN ANIMAL BIOL- OGY is also in press.
Send for a copy on approval
McGraw - Hill Book Company, Inc. PENN TERMINAL BUILDING
370 Seventh Avenue New York
This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AMAll use subject to JSTOR Terms and Conditions
T aluable space on laboratory tables, and valu- able time of laboratory workers, can be saved
by using this Galvanometer with lamp and scale enclosed in the case. The instrument requires no setting up or levelling. It is made in various characteristics, but a single instrument can be used for 99 out of every 100 routine bridge measure- ments. Its period is 3 seconds. Its price is $50.00.
Write for Catalog M-20
~~LEEDS &t NORTHRUP COMPANY ___ ~~4901 STENTON AVENUE PHILADELPHIA, PA.
Electrical Measuring Instruments Hump and Homo Heat Treating Furnaceec Potentiometer Pyrometers Automatic Combustion Control
G-138
This content downloaded from 169.229.32.137 on Thu, 8 May 2014 08:39:25 AMAll use subject to JSTOR Terms and Conditions
