When silicon is used there is a tendency to unsoundness about
the exterior of the ingot, which is surrounded by a honeycomb-like
cellular casing of greater or less depth; while with manganese the
vesicular cavities are more or less dispersed through the whole
substance, or concentrated toward the interior of the ingot. Rails made
from the former are, therefore, more likely to contain unsound portions
near the outer wearing surface, and to give unsatisfactory results in
wear, than those from the latter; but as the test pieces are usually cut
from the center of the railhead, the tensile resistance of the interior
may be equal to or surpass that of the superior material. In summing up
his observations the author concludes that the method of tensile testing
is mainly of value in determining the quality of the material, but that
for the finished product properly arranged falling weight tests are
necessary. He also considers that the test pieces should be flat bars of
2.5 to 3.5 centimeters in area, cut as near as possible to the outer
surface of both head and foot of the rail. He reprobates especially the
research for microscopic imperfections (mikrobensuecherei) upon the
fractured surfaces, as an annoyance to the producer, and perfectly
useless to the consumer.
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