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The statements herein set forth have been compared with a great number of tests, and have been found correct within the of the between which materials can be economically produced in practice. In general, the purer the iron or steel, the more important is the limits uniformity of the process and treatment, and the more difficult It predict the magnetic properties from the chemical analysis. it is is to sig- note that, beginning with the most impure cast iron, and passing through the several grades of cast iron, steel and wrought iron, the magnetic properties accord principally with the amounts of carbon nificant to and a lesser degree with the proportions of silicon, phosphorus, sulphur, manganese, and other less usual ingredients, and that an excess of any one, or of the sum of all the ingredients, has a noticeable present, in on the magnetic properties.
Variation in the thickness of the pile of test-pieces, so that no correction has to be made for such variation. of using easily prepared samples. It has, among other advantages, that The apparatus is shown in Fig. 7. PROPERTIES OF MATERIALS. The magnetic structure ; properties of iron and steel depend upon the physical as a primary indication of which, and as a specific basis for the description of the material, chemical analysis forms an essential part of tests. The physical structure and the magnetic properties are affected to a greater or less degree according to the chemical composition by annealing, tempering, continued heating, and mechanical strains by tension or comThe rate of cooling also influences the magnetic properties of the pression.
27th, 1896. "The Magnetic Testing of Iron and Steel," Proc. Inst. Civil Engineers, May, 1896. Electric Generators. 6 Holden's method consists essentially of an arrangement in which two bars are wound uniformly over equal lengths, and joined at their ends by two blocks of soft iron into which they fit. The rods and about as close together as the windings permit. 25 about 7 Over the middle portion of are parallel, In practice in. in it has diameter, and this arrangement is placed a magnetometer, not necessarily a very sensitive one, with its needle in.