large number of tests, and thai with a weight of ::,„,.
pounds suspended at K and an iron of about i.rv,l;i
silicon, .050 sulphur, he has made a dit'feivnre of OIlr
quarter inch in the final eonlraetion of the free and
restrained bars, and is of the opinion that with higher
silicon, or a softer in»n. In* would
final stretching of trie restrained
the free one over three-eighths
of pattern A is one ineh by o
and three feet four inches long over all, as shown
by the cut at A, Fig. <>°, page .1/5.
Returning to the subject of strrtehing east iron, tin author will cite a few instances ii founding that will further assist to dmi existence of such a quality. As ,n>( fact, I refer to the making of v.inr castings which I made in they«-a: land Rolling Mill Company's i^ni
These were of a design requiriiu and when the patterns wen typed contraction of one-eighth ;: lowed for the castings. I had tit ad these castings when I was our dav the manager to explain to him v, ha! cause the castings (eopr as well as no larger than the patterns, whirl, had loss in other smaller eastings that woi;M !jav« to In-made over in order to eonvspoM'l in -.i. r j., ?h«- «!i!f« r-ent parts of the large pump easting. ffh« • in\ »•• f i'/aj ion simply resulted in showing that thr «!•*•.ij»nrrt ilr-ift--,-man and pattern-maker were all i^n^rant ».i' fl'M-qiiali ties which exist in east, iron, pi-nnittini-, if tobi- stretrhrti when cooling, after st*liiIiJit-at ion h%ls f.tkrn filar*-,