IV. Researches on the elastic properties and the plastic extension of metals

Abstract

On March 7, 1912, I described an instrument which gives photographically a load-extension diagram of a metal test piece during the process of stretching it to fracture. On February 13, 1913, I described further experiments with the instrument. A diagram was shown which was taken from a test piece broken in ten seconds. It is safe to say that up to that time no apparatus existed which would give a complete record of the load-extension relation during such a quick break.