Since 1930 the author’s company has participated in the tests of 111 central station steam turbine-generators of 15,000 kw rating or larger. These were all tests in the owners’ power plants, substantially under service conditions. The measurements were made with calibrated test instruments using the careful procedures which experience has proven necessary if reliable data are to be obtained. The purpose of this paper is to make the testing techniques established as a result of this experience available to the power industry and especially to those directly concerned with tests on central station equipment.

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