Description: Robert Andrews Millikan March 22, 1868 - December 19, 1953, was an American experimental physicist who won the Nobel Prize for Physics in 1923 for the measurement of the elementary electric charge and his work on the photoelectric effect. Millikan graduated from Oberlin College in 1891 and obtained his doctorate at Columbia University in 1895. In 1896 he became an assistant at the University of Chicago, where he became a full professor in 1910. In 1909 Millikan began a series of experiments to determine the electric charge carried by a single electron. He began by measuring the course of charged water droplets in an electric field. The results suggested that the charge on the droplets is a multiple of the elementary electric charge, but the experiment was not accurate enough to be convincing. He obtained more precise results in 1910 with his oil-drop experiment in which he replaced water (which tended to evaporate too quickly) with oil. In 1914 Millikan took up with similar skill the experimental verification of the equation introduced by Albert Einstein in 1905 to describe the photoelectric effect. He used this same research to obtain an accurate value of Planck's constant. In 1921 Millikan left the University of Chicago to become director of the Norman Bridge Laboratory of Physics at the California Institute of Technology (Caltech) in Pasadena, CA. There he undertook a major study of the radiation that the physicist Victor Hess had detected coming from outer space. Millikan proved that this radiation was indeed of extraterrestrial origin, and he named it "Cosmic Rays" As chairman of the Executive Council of Caltech (the school's governing body at the time) from 1921 until his retirement in 1945, Millikan helped to turn the school into one of the leading research institutions in the United States. Typed Signed Letter California Institute of Technology Pasadena California May 16, 1941, 6" X 8 1/2" Some Fold Creases. Otherwise Very Good Condition. ALL MY ITEMS SOLD HAVE A 100% UNCONDITIONAL MONEY BACK GUARANTEE
Price: 169 USD
Location: Phoenix, Arizona
End Time: 2024-12-01T19:19:56.000Z
Shipping Cost: 4.5 USD
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Item Specifics
Restocking Fee: No
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 14 Days
Refund will be given as: Money Back
Industry: Science, Inventor
Signed by: Professor Robert A Millikan
Original/Reproduction: Original Autograph / Reproduction Photograph
Country/Region of Manufacture: United States
Modified Item: No
