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Front Matter Source: The Scientific Monthly, Vol. 61, No. 2 (Aug., 1945), pp. i-viii Published by: American Association for the Advancement of Science Stable URL: http://www.jstor.org/stable/18617 . Accessed: 02/05/2014 16:34 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 194.29.185.146 on Fri, 2 May 2014 16:34:04 PM All use subject to JSTOR Terms and Conditions
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Page 1: Front Matter

Front MatterSource: The Scientific Monthly, Vol. 61, No. 2 (Aug., 1945), pp. i-viiiPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/18617 .

Accessed: 02/05/2014 16:34

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 194.29.185.146 on Fri, 2 May 2014 16:34:04 PMAll use subject to JSTOR Terms and Conditions

Page 2: Front Matter

The

SCIENTIFEIC MONTHILY August 1945

CONTENTS

The Fallacy of the Lost Year ..A. G. Keller 85

The Problem of the Amazon-II . .. Ferreira Netto 90

United States Restrictions on Argentine Beef . .Earl B. Shaw 101

An English Picture of the United States . .William Laas 109

The Cinchona-Bark Industry of South America William C. Steere 114

"Intellectual" vs. "Physical Peak" Performance Harvey C. Lehman 127

Electrical Communication ..John Mills 138

A Biologist Reflects upon Old Age and Death Francis B. Sumner 143

The Spirit of Truth .. . David Moffat Myers 150

Science on the March . . . .153

Book Reviews ..157

Comments and Criticisms . . .163

Meet the Authors. . .iii

PUBLISHED BY THE AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE Smithsonian Institution Building, Washington 25, D. C.

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Page 3: Front Matter

ASTRONOMICAL SOCIETY OF THE PACIFIC

7IHE ASTRONOMICAL SOCIETY OF THE PACIFIC was founded in 1889 by the Director of the Lick Observatory , of the University of California. Membership is not

<S7 yoh,/ limited to professional astronomers, but is open to the amateur and layman as well. Its object is "To advance the Science of Astronomy and to diffuse information coIn-

cerning it". In the fifty-six years of its life, it has grown into a scientific organization of international reputation. Its bi-monthly "Publicationts" has become a periodical of the highest standing, in demand not only by the members but also by public libraries and libraries of higher educational institutions in the United States and abroad. It is especially of value as a reference work.

The Society also issues monthly Leaflets, giving informa- tion on live subjects in non-technical language. These have proved their value, for they are read with interest by professional astronomers as well as by laymen. Particular attention is called to their value to teachers of science in higher schools and colleges.

Institutions as well as individuals may enroll; the annual dues for membership are five dollars, entitling the member to the "Publications" and the Leaflets from date of enrollment. Additional information may be had by address- ing the Secretary, 129 Twenty-fourth Avenue, San Francisco 21, California

THE AMERICAN FERN SOCIETY Affiliated with the American Association for the Advancement of Science

Uj The American Fern Society, originating in 1893 as the Lin- iiean Fern Clhapter of the Agassiz Association, is interested in promoting the study of ferns and fern-allies and in making available to interested students of this plant group the results of such studies. It also facilitates the exchange of specimens and information among its members. A regtular annual meeting is held in connection with the convocation of the A.A.A.S. A summer meeting is devoted to a field trip to interesting fern locations.

(j Membership, distributed throughout the United States and several foreign countries, is open to anyone interested in ferns. Annual dues, inclluding sub- scription to the JOURNAL, are $1.50; life membership, $25.00. The facilities of the herbarium and the library, including the loan of specimelns and books are available to all members.

(J The American Fern Journal, now in its thirty fifth volume, is a quarterly publication of from 140 to 160 pages a year, carrying articles of interest to both amateur and professional students.

EJ Application blanks and further information may be had from the secretary:

MRS. ELSIE G. WHITNEY 274 South Main Avenue Albany 3, New York

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Page 4: Front Matter

THE SCIENTIFIC MONTHLY

Super-FM, made exclusively by RCA Victor, "soundproofs the air". . . eliminates static and other interferences.

RCA Super-FM... storms can he seen hut not heard

With RCA Victor Super-FM, a thun- derstorm becomes a "polite little shower." It can be seen, but never interrupts radio reception.

The first time you hear Super-FM (Frequency Modulation) you'll hard- ly believe your ears! For all static and other interferences are miracu- lously eliminated.

During a thunderstorm you can listeni to a delicate violin sonata- and think you're right in the broad- casting studio! Never before have your favorite symphonies, operas

and popular tunes sounded so col- orful, so full-ranged and so distinct on the radio!

The saine kind of "let's do it bet- ter" research that perfected Super- FM goes into all RCA products. And when you buy an RCA Victor Super-FM radio, or television set, or even a radio tube replacement, you will enjoy a unique pride of ownership in knowing that you pos- sess one of the finest instruments of its kind that science has achieved. * Listen to The RCA Show Sunday, 4:30 P.M., E.W.T., over NBC.

George L. Beers, Assistant Di- rector of Engineering for the RCA Victor Division, is shown here listening to the RCA Super-FM that he developed. Super-FM provides greater ease in tuning and a higher degree of selectivity as well as freedom from noise and interference.

RADIO CORPORATION of AMERICA

RCA BUILDING, RADIO CITY, NEW YORK 20 p

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Page 5: Front Matter

THE SCIENTIFIC MONTHLY

THE SCIENTIFIC MONTHLY Vol. LXI No. 2 AUGUST, 1945 Whole No. 359

An illustrated magazine broadly inter- Address all correspondence concerning edi- preting to the thoughtful public the prog- torial matters and advertising to the Office ress of science and its relations to the prob- of The Scientific Monthly, Smithsonian In- lems confronting civilization. Published by stitution Building, Washington 25, D. C. the American Association for the Advance- Offie of publication, North Queen St. and ment of Science Smithsonian Institution McGovern Avenue (The Science Press Print- Building, WVashington 25, D. C. ing Co.), Lancaster, Pa.

Edited by F. L. Campbell. Subscriptions: The calendar year, $5.00; Advertising Manager: Theo. J. Christensen. single numbers, 50 cents. Editorial Advisers: John E. FTlynn, D. R. Orders for subscriptions and requests for

Hooker, Kirtley F. Mather, and William J. changes of address should be directed to the Robbins. Office of the Permanent Secretary of, the

7ontributing Editors: William A. Albreclit, Association, Smithsonian Institution Build- Arthur Bevan, L. V. Domm, Wilton M. ing, Washington 25, D. C. Two weeks are Krogman, B. S. Meyer, Frank H. H. Roberts, r-equired to effect changes of address. Jr., Malcolm H. Soule, Edward J. Stieglitz, Copyright, 1945, by the American Asso- Harlan T. Stetson, and H. B. Tukey. ciation for the Advancement of Science.

Entered as second-class matter at the post office at Lancaster, Pa., U. S. A. July 18, 1923, under the Act of March 3, 1879.

THE AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF, SCIENCE

Founding and Organization

IN 1848, on September 20, the Association was formally organized and held its first meeting; in 1874 it was incorporated under the laws of the Com- monwealth of Massachusetts and given the right to receive, purchase, hold and convey property. Its gov- erning body is a Council, now having 255 members,

The Association is national in scope, with member- ship open to the whole world on equal terms, and itE interests include the broad fields- of the natural and the social sciences. Its varied activities are carried on under 16 sections with which 189 affiliated and associated societies, having a combined membership of nearly a million, cooperate in organizing programs for its meetings.

Members and Meetings

All persons engaged in scientific work, all who find pleasure in following scientific discoveries, all who believe that through the natural and social sciences a better society may be achieved are eligible for mem- bership in the Association. From its founding, the most distinguished of American scientists, including every American Nobel Laureate in science and. every president of the National Academy of Sciences, have been members. The names of many university presi- dents, of eminent scholars in widely different fields,

and of men notable for public service, including a United States Senator, a Justice of the Supreme Court, and a former president of the United States, are now on its roll of more than 27,000 members.

The Association's meetings are field days of science attended by thousands of participants at which hun- dreds of scientists vie with one another for the plea- sure and the honor of presenting results of researches of the greatest benefit to their fellow men. An enlightened daily press reports their proceedings throughout the country.

Opportunity and Responsibility

A world torn by conflicts and fearful of the future is looking more and more toward scientists for leader- ship. The opportunity f or unparalleled service is theirs and the fact that they have available the only essentially new methods, if not purposes, imposes,an equal responsibility. For these reasons it will be the Association 's steadfast purpose to promote closer relationis among the natural and the social scientists, and between all scientists and other persons with similar aspirations, to the end that they together may discover means of attaining an orderliness in human relations comparable to that which they find in the natural world about them.

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Page 6: Front Matter

THE SCIENTIFIC MONTHLY

MEET THE AUTHORS

OUR leading article of March 1944 was entitled "Helios and Prometheus: A Philosophy of Agri- culture" by Pei-sung Tang, who was then in China serving as director of the Physiological Labora- tory, Agricultural Research Institute, National Tsing Hua University, Kunming. The manu- script had been sent to us by Dr. Tang's friend, C. K. Tseng of the Scripps Institution of Ocean- ography, La Jolla, Calif. Communication with China was difficult at that time and remains un- certain. We could not get a photograph of Dr. Tang to publish with his biographical sketch, and it was not until October 1944 that we heard from

NO 4~~

American Society of Agronomy

Purpose: The increase and dissemination of knowledge concerning soils and crops and the conditions affecting them.

Mevm,bership: Any individual interested in the purpose of the Society is eligible for membership. Membership dues are $5 per year and include subscription to the Journal. Members of the Soil Science Society of America are given special membership rate inieluding the Journal of $4.50 per year, or membership not including the Journal $1 per year. Undergraduate and graduate stu- dents may be elected or student members for which the fee is $1. All memberships are for the calendar year. Additional postage is charged for subscriptions outside of North America.

Publication: The Journal of the American Society of Agronomy is published monthly. This J ournal contains scientific papers, notes, book reviews, and news items regarding mem- bers of the Society. Publication in the Journal is limited to members of the Society.

G. G. POHLMAN, Secretary Agricultural Experiment Station,

Morgantown, West Virginia

The purpose of the National Society of College Teachers of Education is to pro- mote and improve the teaching of educa- tion in colleges and uniiversities of the country. Membership is open to college teachers and administrators. Annual dues for membership are $2.00. The annual meeting is held in connection with the meeting of the Association of American School Administrators. A yearbook is published biennially. The 1942 yearbook bears the title THE DISCIPLINE OF PRACTICAL JUDGMENT IN A DEM- OCRATIC SOCIETY, $2.00; 1944, AD- JUSTMENTS IN EDUCATION TO MEET WAR AND POSTWAR NEEDS, $1.50.

CLIFFORD WOODY, Secretary-Treasurer School of Education,

University of Michigan, Ann Arbor, Michigan

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Page 7: Front Matter

THE SCIENTIFIC MONTHLY

NEW BOOKS* The Meaning of Relativity. ALBERT EINSTEIN. 135 pp. Illus. 1945. $2.00. Princeton University Press, Princeton, New Jersey.

Einstein's theory of relativity has long since ceased to be considered the personal possession of a select few and the re-issue of his own presentation for the general reader who has some understanding of modern physics and advanced mathematics serves again to emphasize the fact. This new edition has an added chapter that incorporates some advances that have been made in the theory of relativity since the first edition was published in 1922. If you have kept up on your mathematics anid physics, you can read it with pleasure.

Cinchona in Java. NORMAN TAYLOR. 87 pp. Illus. 1945. $2.50. Greenberg, Publisher, New York.

Although a laboratory method of synthesizing quinine has been announced, no practical commerical method of synthesis has been worked out. For some time there- fore, the world must rely on getting its quinine from its chief natural source, Cinchona. This illustrated book of eighty-seven pages tells interestingly the story of the discovery of quinine and its use to control the great scourge of malaria. As a disease not unknown to the United States, malaria and its eradication deserves the intelligent understanding of the public and this book fills an inportant place in gaining that understanding.

The Social Systems of American Ethnic Groups. Vol. III. W. LLOYD WARNER and LEO SROLE. 318 pp. Illus. 1945. $4.00. Yale University Press, New Haven.

This, the third volume of the Yankee City Series, focuses attention on the process of assimilation of minority groups into American social strata. It pre- sents a detailed picture of the changes that take place within specific ethnic groups, maintaining the outward forms of their old cultural traditions, but at the same time undergoing changes that make them more and more "American." Some of the social institutions examined include family groups, schools, churches, and social organizations.

The Governing of Men. ALEXANDER H. LEIGHTON. 404 pp. Illus. 1945. $3.75. Princeton University Press, Princeton, New Jersey.

That there is much to learn about governing minor- ities, particularly those of necessity held in segregated areas during wartime, is demonstrated by this clinical study of the Japanese Relocation Center in Poston, Arizona. *The author and his research staff lived in the camp and much of the material presented in the book was drawn from their official reports. Based on the research, a set of principles are formulated for dealing with people under conditions of stress. An appendix outlines the history of the project and techniques used by the research staff.

The Psychological Frontiers of Society. ABRAM IKARDINER et al. 475 pp. Illus. 1945. $5.00. Columbia University Press, New York.

This book presents the results of collaboration between anthropologists and psychologists in the analysis of three cultures: The Alorese in the Netherlands East Indies; the Comanche Indians in the southwestern United States; and ain American community on the fringe of the Middle West. Its objectives are to dis- cover the basic personality types in each of these cultures, how they were produced, and with what im- pact on the totality of the culture itself. The moduts operandi is to describe the social process by a technique which takes as its base line the mental and emotional equipment of a given society. The anthropological data thus gathered are in turn subjected to a psychodynami- cal analysis to determine whether or not individual (or basic) personalities are projective for future genera- tions of the society as a whole.

* Orders for the books noticed above should not be sent to THE SCIENTIFIC MONTHLY or the A.A.A.S., but to your bookseller or the publisher.

MEET THE AUTHORS, Continued

him. He enclosed a very small photograph of himself in a group of colleagues standing outside his mud-walled laboratory before it was bombed out. Thinking that this photograph would not reproduce well, we did not publish it. In May of this year we again got news of Dr. Tang; this time by means of a report written by Professor Wil- liam H. Adolph of Cornell from mimeographed information that had been sent to him by Dr. Tang. Dr. Adolph's report is published in "Sci- ence on the March" in this issue. With the report he sent a good photograph of Dr. Tang and of some of his colleaggues in their makeshift labora- tories. At first we did not see our way clear to use these photographs, and Dr. Adolph was disap- pointed. He wrote: "It was not easy for Dr. Tang to send these and there were painful war- time formalities that had to be complied with to insure their arrival in this country." Then we decided to publish some of the photographs in "Meet the Authors."

The photograph at the top of page iii is that of Dr. Tang, now 42 years old. He took his doctor- ate in plant physiology at Johns Hopkins in 1930 and did postdoctorate research in general physi-

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Page 8: Front Matter

THE SCIENTIFIC MONTHLY v

MEET THE AUTHORS, Continued

ology at Harvard before returning to China.

The n e xt picture shows Dr. Lou Cherng- how blowing glass. Note the homemade alcohol lamp and bellows and the kerosene can serving as a pressure tank.

The photograph of. the chemical laboratory shows Dr. Yin Hung- chang analyzing tung oil. The windows are

boarded for protection against theft and against the shattering of glass by bomnbs.

In the view of the library Dr. Tang is enjoying Life.

The last picture shows the water supply of the laboratory. Water is carried from a well to the lower tank by a coolie. It is then pumped by hand to the upper tank.

A BIOGRAPHICAL sketch of JOHN MILLS was given on page vi of the June 1945 SM in con- nection with his article on electronics. H i s photograph,' which was received too late for publication in June, is published here to accom- pany his 'present article on electrical communica- tion.

FOR the life history of DR. A. G. KELLER see page iii of the March 1945 SM. Again Dr. Keller ex- poses himself to criticisms that are always the lot of any outspoken social scientist. His intel- lectual feelings were heavily calloused long ago.

DR. F. B. SUMNER also was formally introduced in the March issue, although he was then a pillar of THE SCIENTIPIC MONTHLY. He and Dr. Keller are a pair of rugged Emeriti.

FOR DR. HARVEY C. LEHMAN'S life see page v of the November 1944 SM.

CORRECTION: DR. GEORGE URDANG points out that he was not a founder of the first society of the history of pharmacy. (See SM, July, 1945, p. iv.)

1 Photo by John Mills, Jr. On page vi the photo- graphs are from the following sources: Shaw, unknown ; Laas by New York Times; Steere by Day, Ann Arbor; Meyers by Blackstone, New York, N. Y.

NEW BOOKS* Fact and Fiction in Modern Science. HENRY V. GILL, S. J. 136 pp. 1944. $2.50. Fordham Uni- versity Press, New York.

This is the first American edition of a book that ran through three successive editions in Eire. The author studied under Prof. J. J. Thomson in Cambridge's Caven- dish Laboratory and has had many years of lecturing and teaching. The publisher's foreword states that it was written to present the Catholic point of view on the important issues of latest scientific research. It bears the imprimatur of Archbishop John Carroll of Dublin.

Electromagnetic Engineering. Vol. I-Fundamen- tals. RONOLD W. P. KING. 580 pp. Illus. 1945. $6.00. McGraw-Hill Book Company, New York.

The first volume of a projected three volume series covering the field of electro-magnetic engineering. The material represents an expansion of lectures given at the Cruft Laboratory of Harvard's Graduate School of Engineering. The principal sections are devoted to transmission lines, antennas, wave guides and wave propagation. Appendices include a bibliography, an in- dex of symbols and problems for each chapter of the text.

Ageing and Degenerative Diseases,Vol. XI, Biologi- cal Symposia. Various Authors. 250 pp. Illus. 1945. $3.00. The Jaques Cattell Press, Lancaster, Pa.

The papers presented at a symposium on the topic are brought together in one volume. With the statistical evidence pointing to an era in which the ratio of older people in the total population will increase, the problems of geriatric medicine merit continued study. Many of the more common diseases of old age are described at length and verbatim transcripts of the roundtable dis- cussions bring out the viewpoints of leading authorities in the field.

Dynamic Meteorology. JORGEN HOLMBI3E, GEORGE E. FORSYTHE and WILLIAM GUSTIN. 378 pp. Illus. 1945. $4.50. John Wiley and Sons, Inc., New York.

Mark Twain's celebrated remark that nobody does anything about the weather will no longer hold water and the evidence lies in this well-prepared text. The importance of weather during both war and peacetime should suffice to warrent close attention to the matter of forecasting. The extended use of weather data by such widely separated of man's activities as farming and flying will bring an increased demand for practical, but scientific, publications dealing with the subject. This volume with its emphasis on the physical behavior of the atmosphere and its motion is based on course work presented at M. I. T. and the University of California.

The Psychology of Women. Vol. II-Motherhood. HELENE DEUTSCH. 498 pp. 1945. $4.50. Grune and Stratton, New York.

Dr. Deutsch has subtitled her second volume in this series, "Motherhood." She has wisely continued her approach used in the first volume-that of presenting the normal rather than the abnormal. Likewise she has emphasized the psychosomatic interdependence of the psychological and physiological processes as demon- strated in the female reproductive activity. Physicians, physiologists and psychiatrists will all find worthwhile the detailed case histories that explore the successive life phases of mature womanhood.

How to Solve It. GEORGE POLYA. 204 pp. Illus. 1945. $2.50. Princeton University Press, Princeton, New Jersey.

EAach day brings to every person problems that must be solved and this small, compact volume offers a metho- dology for tackling them in a systematic manner. Although the outward form is stated in mathematical terms, it is really an adventure in bringing order to the procedures of the mind when first confronted with a seemingly unsolvable problem. The clarity of analysis and logic of discussion make the methods outlined adaptable to any field of human activity.

* Orders for the books noticed above should not be sent to THE SCIENTIFIC MONTHLY or the A.A.A.S., but to your bookseller or the publisher.

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Page 9: Front Matter

THE SCIENTIFIC MONTHLY

MEET THE AUTHORS, Continued

EARL B. SHAW, Ph.D., is Professor of Geog-

,',:....... .r..... .aphy at State Teach- ':'::.::'.B .:-:E::::::::::::::::: D'::::f:..... ......... '::-f-S.:x

ers College, Worcester Mass. He was born at Monroe, Iowa, in 1889. After graduating from high school he spent a few years in business a-nd later two years in the army. After World War I he entered Wash- ington University at St.

Louis, where he received his A.B. and M.S. de- grees. In 1933 he obtained his doctorate in geog- raphy at Clark University. Besides teaching at S.T.C., Worcester, he has been on the faculty of Washington University, St. Louis, and the Uni- versity of Puerto Rico, Rio Piedras-on the latter faculty on two occasions, 1932 and 1940. He has traveled widely and in 1939 lectured on shipboard about the geography of Latin America for the World's Federation of Education Association's tour and conference in Latin America. He has published many articles in the field of, economic and Latin American geography and has also col- laborated on two books, Amnerica at WVar and The

WILLIAm LAAS, A.B., is a journalist whose spe- cialty was "features." His interest in geogra- phy is a by-product of his work on pictorial features. Born in Bos- ton in 1910, he gradu- ated from high school in New York at the ten- der age of w 13. Bef ore entering Columbia he became a seasoned news-

paperman. In 1-935, two years af ter his gradu- ation from Columbia, Mr. Laas became managing editor of United O Features Syndicate, a United Press subsidiary that produced f or some 1,200 newspaper clients a long list of well-known f ea- tures ranging f rom comic strips to big-name columns. Early in the war Mr. Laas became an editor in the Office of War Information, dealing with publications intended to acquaint foreign readers with America and her war effort. Last year Mr. Laas joined the Office of Strategic Ser- vices and spent seven months on the Italian front. He may now be addressed at 405 East 54th Street, New York 22, New York.

MEET THE AUTHORS, Continued

WILLIAMI C. STEERE, Ph.D., ranks as Asso- ciate Professor of Bot- any at the University of Michigan. One might say that he was born to be a professor at Ann Arbor, for his grand-

fathers had been pro- fessors at the Univer- sity of Michigan, one in zoology and the other in medical anatomy. Dr.

Steere began his career in Mnskegon, Mich., in 1907. Of conrse, he went to the University of Michigan. Wisely he spent two years in gradnate stnd y at the University of Pennsylvania before retnrning to Ann Arbor for the doctorate and to join the facnlty. A year as exchange professor at the University of Pnerto Rico and a field sea- soning in Yncat'an gave himi experience in tropical American flora which served him well on his mis- sion as senior botanist for F.A.E. on cinchona from September 1942 nntil December 1944. Dr. Steere has been president of' the Snlliva'nt Moss Society and since 1938 editor of its jonrnal, The Bryolo gist. Obviously Dr. Steere is a moss spe- _,- 1_ _

DAVID MOPPFAT MYERS, M.E., is a consulting en- gineer at 21 East 40th Street, New York 16, N. Y. He was born in Owasco, N. Y., in 1879 and studied mechanical engineering at Colum- bia. He has been a consulting engineer in the field of industrial power since 1907 and has served many of the

leading industrial corporations in the United States, Canada, and Cuba in the solution of their power problems. During World War I he pro- posed the National program for fuel conservation in power plants and on railroads, which was exe- cuted through the U. S. Fuel Administration, which he served (as volunteer) as Advisory Engi- neer and Chief of Fuel Engineering Division. He is the author of four books on industrial power. Of his hobbies he writes: "Inventions, writing, sketching, sailing, and riding. Too many! Life is too short and too interesting, afid I live most happily with my wife in Larchmont, N. Y., where we share and enjoy each other's interests."

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Page 10: Front Matter

THE SCIENTIFIC MONTHLY

NEED TO MEASURE CONTINUOUSLY? Here Are L&N Automatic Instruments For the Laboratory

Where laboratory work requires a reliable, continuous measure- ment by means of a null-type electrical measuring circuit, you're likely to see L&N balance-type recorders providing the needed data. Motor-driven, these instruments balance against their own built-in standards of accuracy. They are precise, sensitive, reliable instru- ments for indicating, recording, or controlling. Shown here are three models-Model S strip-chart Micromax, Model R round-chart Micro- max. and Speedomax Recorder.

To Draw a Detailed Record Automatically . . - Model S Micromax records from one to 16 points on a

chart 97" in calibrated width. Available as an automatically standardized potentiometer for use with thermocouple, Rayo- tube or pH electrode; for polarized dropping mercury elec- trode-as a Wheatstone or Kelvin Bridge-and as an a-c re- corder for electrolytic conductivity, frequency, etc. Usually equipped to signal and/or control. Features an especially roomy case with ample space for accessory relays, etc.; sepa- rately-hinged frame castings for chart and balancing mecha- nism makes all parts highly accessible. Appropriate catalog on request; please state your needs in as much detail as possible.

To Indicate with Unusual Clearness Model R Micromax excels in long-range visibility and

extra-clear indication. A big black pointer moves around the boldly marked scale . . . the round chart is usually for a 24-hour period. The instrument can record one or two points-can be equipped to operate signals, alarms, and auto- matic controls. Appropriate catalog on request.

To Record with Unusual Speed . . . Speedomax Recorders can be used with proper acces-

sories to measure spectrometer output, temperature of mov- ing objects, radio field strength, radio sonde signals, and other conditions which require exceptional speed. In just 12 seconds, the pen of a Speedomax Recorder sweeps all the way across its wide strip-chart. A black pointer moves across a bold scale, visible from a distance of 10 feet or more. Null-point balance is achieved by electronic means, while a reversing motor balances the null-point detector through grid-controlled arc tubes. Appropriate information on re-

MIodel S Micromax, 1/11 Actual Size.

Model R Micromax, 1/11 Actual Size.

t_....-..... ts ... ..N... ,,...-.. .... .... .. .. . ..

P! Speedomax, 1/20 Actual Size.

2LEEDS & NORTHRUP COMPANY, 4945 STENTON AVE., PHILA. 44, PA.

- AS de- ends on a WAU4RING INSTRUMENTS - TELEMETERS . -AUTOMATIC CONTROLS EATTRATING FURNACR _ _ _ slogan For Every Ameri

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Page 11: Front Matter

viii THE SCIENTIFIC MONTHLY

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these advance lookouts rely on the superior performance of high quality binoculars. They know that a far-away object on the horizon can be quickly identified with these powerful glasses. The name Bausch & Lomb has long stood for such optical precision. The world's finest binocular today is Bausch & Lomb. Bausch & Lomb Optical Co., Rochester 2, N. Y.

BAUSCH& LOM~B ESTAB LIS HED 18 53

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