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A self-contained extensometer is described for rapid and highly accurate tension testing of several samples of rigid plastics over the entire range from zero load through fracture. The instrument has high sensitivity and linearity; negligible friction, backlash, and dead zone; a construction that permits installation after the specimen is located in the machine and that permits leaving the instrument on during fracture; and a design that averages the strain of the specimen. The instrument may also be used on metals whose hardness is significantly less than that of the gage points.
Professor of engineering, Brown University, Providence, R.I.
Deputy division leader, Organic Materials Division, Lawrence Livermore Laboratory, Livermore, Calif.
Stock #: JTE11214J