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Full text of "Metallurgy Of Cast Iron"

MKTJIODS OK CAS'ITNC,   TEST  P.ARS  FOR TUK A. V. A.      553
macic in dry sand, making a total of eight bars of each kind. Nearly one-half of the total number was finished by being planed if square, and turned if found bars, so as to make a comparison, between the rough cast bars and those \vhich had a trifle more than % inch of stock removed from their surface. This was done by finishing down the rough bars to correspond in size to those of next smaller dimensions as, for example, a ..jj-j-inch rough bar was turned down, to a 4-inch bar, and a .{.-inch bar down to a ^J.-j-inch bar, and soon until a i-inch rough bar was finished to a '..-inch bar. This finishing work was chiefly clone by l)r. R. Mohlenke.
There were 1,601 tests made on 1,229 test bars, not counting the chilled pieces and fluidity strips, making, roughly, 15 tons of test specimens that were handled. To tabulate all the tests as they originally appeared in the American Foundrymen's Association Journals, and which were originally designated from A to L, making a total of 12 different, grades or specialties that were tested, would require more space than could be justly given here. In an effort to condense the results of thr A. I1'. A. tests, and at the same time present a fair summary of the whole, the author has omitted, e:\cepting J'n n!U> °r IAV° instances, all tests of square bars and those of round bars cast in dry sand, which ivdmvs the records to 2X2 tests as shown in Tables $ 15 to i ;M>, pages 55-S to 570. However, a study of what tests are presented in connection with the summary at ihe elnse of l lu: tables will, the author believes, better :er\e tin,- end for many than were all the original tables published, without reduction <>r comment at his hands. The work involved in obtaining these tests can only be known by those who have followed up such testing, andhen  the  moulds were  filled  all  surplus metal in diameter, and cast on end, us such will tfive truer results than the [J4™inch round bar in general practice, especially in making comparison <>i; the widest ranges in grades.temper '' or damp-              ,| |