A report on an experimental and theoretical investigation of the equilibrium conditions for the case of a ball balanced on a jet of water

Spinney, L. B.

English

University of Northern Iowa

Proceedings of the Iowa Academy of Science Volume 34 Annual Issue Article 77 1927 Ball and Jet in a Vacuum L. B. Spinney Iowa State College Copyright ©1927 Iowa Academy of Science, Inc. Follow this and additional works at: https://scholarworks.uni.edu/pias Recommended Citation Spinney, L. B. (1927) "Ball and Jet in a Vacuum," Proceedings of the Iowa Academy of Science, 34(1), 277-277. Available at: https://scholarworks.uni.edu/pias/vol34/iss1/77 This Research is brought to you for free and open access by the Iowa Academy of Science at UNI ScholarWorks. It has been accepted for inclusion in Proceedings of the Iowa Academy of Science by an authorized editor of UNI ScholarWorks. For more information, please contact scholarworks@uni.edu. PHYSICS ABSTRACTS 277 THE RELATION BETWEEN THE PHOTOELECTRIC AND THE PHOTOGRAPHIC EFFECT IN SILVER BROMIDE L. w. BUTLER *Toy, Edgerton, and Vick have recently shown that the photo-electric effect in silver bromide is due to ultraviolet light of wave-length less than f.2800A. Since the photographic effect extends to l.SOOOA they concluded that there is no relation between the pho-toelectric and the photographic effects in silver bromide. Before this article appeared, the writer had obtained approxi-mately the same result with silver bromide formed by fuming the surface of a silver plate. Our data was obtained by the use of more sensitive apparatus than that employed by the above named investigators. In order to prevent deterioration of the silver bromide the plate was kept in complete darkness until the time of exposure by which measurements were made. IowA STATE CoLLEGE, AMES, IowA. BALL AND JET IN A VACUUM L. B. SPINNEY A report on an experimental and theoretical investigation of the equilibrium conditions for the case of a ball balanced on a jet of water. IowA STATE COLLEGE, AMES, IowA. PHOTOMETRIC MEASUREMENTS OF THE REFLEC-TION FACTOR OF COTTON AND LINEN HOUSEHOLD MATERIALS EARL C. McCRACKEN By means of a specially constructed reflectometer measure-ments have been made on the variation of the reflection factor with different methods of laundering of both cotton and linen household materials. Results show that the method of washing has a decided effect upon the permanency of the whiteness as indi-cated by the total reflection factor. It was found that special *Phil. :\fag., \"ol. 3, p. 482, Feb., 1927. 1Spinney: Ball and Jet in a VacuumPublished by UNI ScholarWorks, 1927

Ball and Jet in a Vacuum

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Ball and Jet in a Vacuum

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