(Vintage text book from a private collection.)
Vintage text book from a private collection.
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(This book was originally published prior to 1923, and rep...)
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(Excerpt from A Bolometric Study of the Spectrum of an Abs...)
Excerpt from A Bolometric Study of the Spectrum of an Absolutely Black Body Between the Temperatures of 300° and 1100° Centigrade For this purpose being made as narrow as possible. Since 4 5 then the bolometer of Langley, the radio micrometer of Boys. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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Charles Elwood Mendenhall was born on August 1, 1872 in Columbus, Ohio. He was the only child of Thomas Corwin Mendenhall and Susan Allen Marple. His father, of Pennsylvania Quaker stock, was professor of physics at Ohio State University and later in turn president of Rose Polytechnic Institute, superintendent of the United States Coast and Geodetic Survey, and president of Worcester Polytechnic Institute. His mother was of English descent.
When Charles was only a small boy he spent three years in Japan while his father was on the faculty of the Imperial University of Tokyo. This experience made a lasting impression on him and engendered in him a lifelong love of Japanese art and respect for Japanese scholars. Graduating from Rose Polytechnic Institute in 1894 with Phi Beta Kappa and Sigma Xi membership, Mendenhall, he then went to Johns Hopkins University, where he received the degree of Ph. D. in 1898.
After a brief experience in gravity survey work, Mendenhall taught physics for a year at the University of Pennsylvania. After three years as instructor at Williams Collegehe was appointed assistant professor of physics at the University of Wisconsin and was promoted rapidly, attaining the rank of professor in 1905. In 1926 he was made chairman of the department, which, under his supervision, ran with smoothness and harmony largely due to universal respect for his personality and judgment. He held this position until his death, which occurred after a lingering illness. During the First World War Mendenhall was made a major in the Signal Corps, and he rendered valuable service in connection with the application of scientific devices and inventions to military purposes. At the end of the war he served for some months as scientific attaché to the American embassy in London. From 1919 to 1920 he was chairman of the division of physical sciences of the National Research Council, and his interest in and service to this organization continued throughout the rest of his life. He was elected to the National Academy of Sciences in 1918 one of the four members whose fathers were also members at the same time and to the American Philosophical Society and the American Academy of Arts and Sciences somewhat later. He was president of the American Physical Society, 1923-25, and vice-president of the American Association for the Advancement of Science in 1929. Young investigators were always accorded full credit and, no matter how much he had contributed intellectually, his name was rarely attached as collaborator to a piece of work unless he had actually taken part in the measurements.
The span of Mendenhall's life comprised a period of rapid growth in the science of physics. He played an active and important part in this development through his teaching and administrative work, his investigations recorded in some twenty-four papers published in the Physical Review, Astrophysical Journal, Proceedings of the National Academy of Sciences and other technical journals, his share in the authorship of two physics textbooks, and his service on innumerable physics committees. His research interests were so broad as to earn for him the reputation of being "one of the few remaining natural philosophers. "
(Excerpt from A Bolometric Study of the Spectrum of an Abs...)
(This book was originally published prior to 1923, and rep...)
(Vintage text book from a private collection.)
While Mendenhall's investigations were concerned with such widely different subjects as gravity measurements, sensitive galvanometer design, and melting-point determinations, most of his interests centered about matters connected with radiation and culminated in his originating the V-wedge blackbody. This consists of a thin strip of the metal under investigation, bent so that its cross-section is a narrow V and electrically heated. It has great value in certain problems in pyrometry inasmuch as it allows a ready comparison of the characteristic radiation of the metal under investigation with blackbody radiation.
In his later years he began, with the aid of his students, a systematic investigation of certain phases of the photoelectric effect. In the matter of publication he set an example in caution and conservatism. Publication was occasionally held up for weeks or months until some vital point could be given a final check.
a member of the National Academy of Sciences
The word "why" was one of the most used in Mendenhall's vocabulary. He wanted to get to the bottom of things and was unwilling to stop until he had done so. His work was characterized by thoroughness, precision, insight, skill, and a perseverance which would not admit the possibility of failure.
On the personal side Mendenhall was straightforward and unassuming, with an essential reasonableness of judgment, a keen sense of humor, and a wide variety of interests including music, art, and his hobby, fly-fishing. He disliked display of any sort or any catering to appearance, and was extremely reticent in all matters connected with himself. With all his widely varying interests Mendenhall was mainly concerned with his work as a teacher. He was at his best in advising with his graduate students, of whom he always had a large group.
His knowledge of physics was unusually broad and deep, and he was always ready to discuss any phase of the subject. Many hours a day were often spent in this way, and when in his last illness it was finally necessary to remove him to a hospital his room became his office for such conferences. He could always be counted on to pick out the weakness in an argument, and the student had to show clear-cut thinking to carry out his point.
Quotes from others about the person
"Mendenhall would be a greater experimentalist if he did not give so much time to his students. "
On February 14, 1906, Mendenhall married Dorothy M. Reed of Talcottsville, New York, herself a scientist and a recognized authority on child health. They had met at Johns Hopkins, where Miss Reed received the degree of M. D. in 1900. Two sons, Thomas Corwin and John Talcott, were born to them.
4 October 1841 - 22 March 1924
19 December 1849 - 6 November 1916
22 September 1874 - 31 July 1964
19 February 1907 - 20 February 1907
1909 - 9 November 1910
8 May 1913 - 7 March 2003
14 June 1910 - 18 July 1998
