Word: hultgren
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Dates: during 1930-1939
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...inventor is Dr. Ralph R. Hultgren, instructor in Metallurgy who is now completing the equipment after a year's work...
...experimental tests Dr. Hultgren has successfully molted iridium at 4230 degrees Fahrenheit; platinum at 3200 degrees; and pallodium at 2790 degrees. Ruthenium was heated to 440 degrees Fahrenheit and "sintered" a little but did no melt...
Since the retirement of Dr. Sauveur, the department of metallurgy has been under the leadership of Dr. A. B. Greninger and Dr. R. R. Hultgren who offer courses in the fundamentals of metallurgy to students in the College, and advanced courses in metallography and the physics of metals to graduate students working for the higher degrees in engineering...
...department concerns itself largely with the theory of metals and alloys based on the study of the crystalline structure through application of X-ray diffraction technique and microscopy. Recently Dr. Hultgren has developed a cathode ray oscillograph apparatus for the measurement of the position of X-ray diffraction lines recorded on photographic film. This apparatus permits the position of the diffraction lines to be measured with great accuracy and rapidity, and is proving a valuable tool in the determination of the distances between the atoms in metallic crystals. These distances are of the order of the hundred millionth part...
...Hultgren has also developed an electron bombardment furnace in which small samples of metallic alloys are heated by the impact of electrons at high velocity. This electron bombardment furnace is capable of heating several grams of metal to a temperature of 3000 degrees Centigrade, and its limiting high temperature is set by the lack of suitable high melting crucibles to contain the sample under study rather than by any inherent limitation in the apparatus itself. This furnace makes possible the experimental investigation of many alloys which were formerly very difficult to melt under the controlled conditions necessary for scientific research...