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December 14, 1940


Author Affiliations

Washington, D. C. Assistant Chief, Mechanics and Sound Division, National Bureau of Standards.

JAMA. 1940;115(24):2104. doi:10.1001/jama.1940.02810500072033

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To the Editor:—  My attention has been called to a medicolegal abstract ("Malpractice: Liability for Injury to Patient from Nurse's Operation of Fluoroscope") in The Journal, September 28.The National Bureau of Standards letter circular LC486, "Metals Do Not 'Crystallize' Under Vibration," has been prepared to answer the many inquiries we receive on this subject.Members of the staff of the National Bureau of Standards are called on to examine many instances of fatigue failure in all sorts of structures. It is our experience that one fatigue failure in a certain part in a given structure which has been in use for a considerable time is all too likely to be followed by a number of like failures in the same part in other structures of the same kind which have given as long or longer similar service.This likelihood is so great that it is frequently thought advisable in

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