S. Edelman and associates of the U.S. National Bureau of Standards have recently developed a new vibration analyser, that can be used for determining vibration characteristics of bodies such as aircraft and missile structures. The instrument uses the principle of a stroboscope, and enables an operator to explore quickly the vibration patterns in a complex structure. In the early stages of an analysis an operator can determine whether his vibration pick‐ups have been located so as to give him the information he needs.
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