452 METALLURGY OF CAST IRON.
same iron and gate, I forwarded the specimens of which the analyses are herewith given to the late C. A. Bauer, M. E., general manager of Warder, Bushnell & Glessner Co., Springfield, O., who had his son, Charles L. Bauer, a chemist, make the determinations shown in the following paragraphs:
The specimens were one-half inch square, one inch square and one and one-eighth inch round bars, belonging respectively to light machinery and chill roll iron tests, which were among those reported in rny paper before the Western Foundrymen's Association, October 18, 1894, seen on pages 461 and 464. Paragraph No. i gives.the combined carbon at the corners and center surface of the fracture of the one-inch square bars in the chill roll and light machinery mixtures.
Paragraph No. 2 is a report of the sulphur contents of the center of the bars shown in paragraph i and also that of the one-half inch square and one and one-eighth inch round bars shown in paragraph 3, which were poured with the same gate and iron as those in paragraph i.
Paragraph No. 3 shows the difference in combined carbon existing in the center of the one-half inch square, one inch square and one and one-eighth inch round bars described in paragraphs Nos. i and 2.
DETERMINATION No. i.—Combined carbon in chill roll iron: At the corners, 1.55 per cent., at the center of the fracture, 1.416 per cent., or .134 per cent, more combined carbon in the corners than in the middle of the test bars. In light machinery iron: At the corners, .72 per cent. ; at the center, .65 per cent.; or .07 per cent, more combined carbon in the corners than in the center of the fracture....... .82 •50 .<)! •97 1. 10 .68 ..... .2,S"