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<p>A method was employed to determine the degree of magnetic uniformity along the bars. Barrel forgings were first tested by a point-by-point method [Abs. 1917A00551], and afterwards by a method similar to that used by Burrows for testing steel rails. A magnetising solenoid surrounds the bar and travels along its length; a test coil is mounted within the solenoid, and is connected to a galvanometer which indicates variations of magnetic flux within the bar. By means of a moving photographic film a permanent record of the motion of the galvanometer spot of light is obtained when the mignetisng coil is run the length of the specimen at uniform speed. Records are given for tests made when strips of transformer iron of various shapes were attached to the bar.%
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