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| Keywords: MetalFatigue 003.jpg Close-up of the vibration-responsive automatic stopping device recently developed at the National Bureau of Standards for use with fatigue-testing machines A steel ball is balanced on a three-pronged pedestal which is fastened to one of the testing machine bearing boxes at a point near the test specimen When a crack begins to form in the specimen vibration increases Shaken from its pedestal by the vibration the steel ball closes an elecrical circuit thus actuating a relay and stopping the machine National Institute of Standards and Technology National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology | ||||
