This invention relates to testing machines for use in testing notched bars such as are usually broken in machines of the Izod or Charpy type and the invention consist in an improved construction of machine which is capable of producing upon a chart during a test a continuous auto-graphic curve expressing the relation at any moment between the bending moment applied to the test piece or specimen and the angular distortion which the bending moment produces in it ; and further my improved machine is provided with apparatus for directly and visually indicating on a gradual dial, the energy expended in bending or breaking the test piece.
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