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Full text of "Metallurgy Of Cast Iron"

CHAPTER LXX.
METHODS   OF   CASTING TEST BARS FOR
THE A. F. A. TESTS, COMPILATION
AND SUMMARY OF RESULTS.
Prior to about 1890, there had been felt for many years the need of tests on cast iron, to give those interested in its use reliable data of its physical qualities. I         Some work had been done in an effort to obtain records
\         that could be used, but before the appointment of the
American Foundrymen Association's committee, in the
f        spring   of   1898,   little   of  practical   value   had   been
obtained aside   from   that   presented in the first two ,         editions of this work.    This was due in part to  the
,,         want of a broad experience in founding  by experi-
!J         mentors,   and   their   inability   to   originate   practical
|;         methods for moulding and casting test specimens in
!          the right manner.    Some, for one example, started off
ff         with an elaborate series of tests on one grade of iron
only, thinking that such would suffice, when in reality there are about a dozen  grades  that  should be considered.    Aside from this error the bars were all cast r          flat, and at different pouring temperatures.
>           The unreliability of records and systems for testing
that were pressed on the trade from 1890 to 1899 caused-the author to labor in every way he could to show wherein they erred, and to get others interested sum-2