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Full text of "Metallurgy Of Cast Iron"

STRENGTH   IN   SPECIALTY   MIXTURES.              469
closely corresponding with the transverse load of one square inch area bars in the same Table, and which would have been still better could the bars only have been cast on end.
The next size and form of bar to consider is that of the one-inch square. In comparing the fracture of the square with those of the round bars (sec pages 472 and 473), the grain of the former will average denser and all square bars, excepting those of " white iron " fracture, show the bars to be much denser at the corners than on the flat surface section of the bars, thereby giving a less uniform grain and causing more internal, strains in a square bar. They are also weaker than a round bar. This point the records of Table 98 fully prove, by showing that the round bars record a greater strength than square bars of like areas. I do not wish to be understood as saying we should adopt the method which will show the greatest strength in the bar, but rather the one best to insure knowledge of the natural relative qualties of cast iron mixture's, and this the round bar will do.
TAHI.K   ijS.      SfMMAKV    <»!•    HKST    STKKN<;T!I    AVK.KACKS   OK   ROUGH rnl M>  VS.   Sol'AKK TKST HAUS.
r.un im-lal...........,........ Average of ij,i in. round bars..........................^,(»Sfi Ibs.
"       ".....................       "        "   i in. .square bars...........................,i,.M4 "
Chill roll „„,,...................       "         "   ijYjin. round bars.........................a,yS<> "
"       "    ...,,......,,„..,......       "        "   i in, square barn...........................2,432"
Car' wheel,,.„.„,................       "        "   i'« in. round bars...........,..............'^..S.S.i "
"       ".......................       "         "   i in. Hquarc barn............................^.15° <(
Heavy machinery.........       "        "   t!tt in. round burs..........................*fi$7 "
11            "............      "        "   i in square hnrH........................
Light iitiu'huirrv...........       "        "   i '/> in. round barn.....................
"            "4............       "        H   j in, square bar«......................
Stove plate.....................       "        "   i J-» in. round bars......................
"        ".....................      "        "   t in. js<|itarc bars.......................
Sar»h weight....,.......... .      "        "   i * i\ in. round bars....................
"         "................      "        "   i in. square bars.,..........,.,.,.,...                        £