Biographical Memoirs Volume 67 (1995) / Chapter Skim
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Jacob Pieter Den Hartog
Jacob Pieter Den Hartog
Pages 100-117
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From page 101... ...
He was internationally famous as a vibration consultant with an uncanny ability to identify and explain the cause of a mysterious vibration. But, above all, Den Hartog was a consummate teacher.
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From page 102... ...
tarp was such an outstanding high school student that some of his relatives undertook to pay his expenses at the Technical University of Delft. Entering Delft in 1919, young Den Hartog decided to become an electrical engineer after seeing a dramatic physics demonstration in which a bolt of lightning jumped from one charged sphere to another.
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From page 103... ...
it was here that Den Hartog served his real professional apprenticeship. In the next three years Timoshenko converted the young electrical engineer into a mechanical engineer by assigning him a wide variety of vibration problems across the whole spectrum of Westinghouse products: electric motors and generators, steam turbines, hydropower turbines, railroad electrification, etc.
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From page 104... ...
. urgent real pro Stems gave him a unique practical approach to the subject, which illuminates his famous text, Mechanical Vibrations.
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From page 105... ...
When this unlikely cure completely solved the problem of broken shafts, his reputation as a vibration expert was launched. While at Westinghouse, Timoshenko was one of the activists pressing for the establishment of a separate Applied Mechanics Division within the American Society of Mechanical Engineers (ASME)
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From page 106... ...
Full of enthusiasm, he poured his energies into his vibrations course, getting an extensive collection of demonstration models made en c} starting to write his famous text Mechanical Vibrations. Although only thirty-one years old, he already was widely known as a vibration expert.
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From page 107... ...
While at the University of Michigan, Timoshenko organized an annual special summer school for teachers of mechanics, which had an important influence on mechanics education in America. Den Hartog acted as a guest lecturer for several summers in this program while he was at Harvard.
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From page 108... ...
Their second son, namect Stephen Ludwig, in honor of Timoshenko and Prandtl, respectively, was born in 1933. A weekly ritual was the musical evening when Magpie, joined by two fellow amateurs plus a professional cellist, played string quartets.
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From page 109... ...
This group of some forty officers and sixty enlisted men was to follow the advancing Allied forces with the aim of debriefing enemy technicians and capturing interesting technical equipment. Commander Den Hartog was an ideal choice for this mission.
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From page 110... ...
In Denmark Den Hartog stumbled on a number of midget submarines still in shipping containers and was able to arrange to have five of them, plus five trained German operators, sent back to the States for careful appraisal of their capabilities. The technical mission worked hard for a year.
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From page 111... ...
The buildings on the island in Lake Winnipesaukee were expanded to facilitate entertaining, and an isolated study cabin was built with a huge desk looking out on the water. It was here that Den Hartog wrote his textbooks on Mechanics (1948)
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From page 112... ...
In all there were fifteen foreign editions published in eleven languages. When Den Hartog returned to teaching in 195Qv, the jet airplane had arrived and was making travel more convenient, especially for lecture tours and consulting visits.
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From page 113... ...
On his birthday MIT's Department of Mechanical Engineering established the Den Hartog Prize for "excellence in teaching." A few months later the British Institution of Mechanical Engineers awarcled him the prestigious lames Watt Medal. Then the National Academy of Engineering awarcled him its top honor, the Founders Award.
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From page 114... ...
When the medal was delivered to him he was pleased to think that "his boys still remembered him." Those of us who were fortunate enough to have known him in his active days will always remember his uncanny physical insight and the energetic enthusiasm and sparkling wit with which he macle it all seem so clear. ~ WISH TO THANK Stephen L
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From page 115... ...
JACOB PIETER DEN HARTOG HONORS AND DISTINCTIONS PROFESSIONAL SOCIETIES American Society of Mechanical Engineers American Consulting Engineers Council American Society of Engineering Education Institute of Aeronautical Sciences Sigma Xi Society of Naval Architects and Marine Engineers Tau Beta Pi HONORS AND AWARDS American Academy of Arts and Sciences, Fellow American Society of Mechanical Engineers, Honorary member Japan Society of Mechanical Engineers, Honorary member National Academy of Sciences, Member National Academy of Engineering, Member Royal Dutch Academy of Arts and Sciences, Foreign member Charles Russ Richards Medal, Worcester Reed Warner Medal, Timoshenko Medal, ASME Medal, and the Jacob Pieter Den Hartog Medal of the American Society of Mechanical ~ . ~ nglneers 115 Founders Award of the National Academy of Engineering Lamme Medal of the American Society of Engineering Education Order of the Rising Sun Thomas Hawksley Lecture and the James Watt International Medal of the Institution of Mechanical Engineers Trente-Crede Medal of the Acoustical Society of America HONORARY DEGREES Carnegie Institute of Technology Salford University Technical University of Delft University of Newcastle-[Jpon-Tyne University of Ghent
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From page 116... ...
ASH, paper APM54-14. Transmission line vibration due to sleet.
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From page 117... ...
The torsional critical speeds of geared airplane engines.
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