A tensile testing unit is described which permits the testing of highly-radioactive specimens at temperatures up to 800 C (1475 F). The vacuum tensile furnace, mounted on a 60, 000 pound Baldwin tensile machine, is constructed to permit the measurement of elongation by a newly developed optical instrument. Tensile elongation measurements of 50 per cent with one-inch gage length specimens makes the unit a relatively long range extensometer.
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