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轻便的大型齿轮齿距误差测量仪系由澳大利亚NPL(国家物理研究所)设计,NSL(国家标准研究所)改制并用来测量直径12英尺(3.66米)大型螺旋齿轮齿距误差的一
The lightweight, large gear pitch error measuring instrument was designed by NPL (National Institute of Physics) of Australia and reworked by NSL (National Institute of Standards and Design) and used to measure the pitch error of a large helical gear 12 feet (3.66 meters) in diameter