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Updated: April 30, 2025
The field core is, according to size, built up either of steel disks, each in one piece, or of steel forgings, so as to give high magnetic permeability and great strength.
Its employment has most importantly contributed to secure perfect soundness in such class of forgings. In the old system of forging cylindrical shafts, the bar was placed upon a flat-faced anvil. This simple and common-sense improvement was eagerly and generally adopted, and has been productive of most satisfactory and important results. A Spherical-seated Direct-weighted Safety Valve.
To make forgings economically, it is necessary to bring them into the desired form by a few heavy blows, while the material is still in a highly plastic condition, and then to finish them by a succession of lighter blows. The heavy blows should be given at a slower rate than the lighter ones, to allow time for turning the work in the dies or on the anvil, and so to avoid the risk of spoiling it.
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