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Full text of "Metallurgy Of Cast Iron"

CHAPTKk   LVIII.
ACHIEVING UNIFORM   RECORDS,   AXh UTILITY OP TEXSILK TKSTS.
Any research to discover uniformity between tensile and transverse tests, up to about 1^5, shows that one ]>lan of testing* j^ave very• different results than some others, and only bewilders instead of assuring an inves ti#ator that he has obtained any knowledge «»!' tin-iron's true strength. There is n<» reason why flu* .saun* iron should show sueh erratic records as have been evinced up to 1^95, between tensile and transverse tests, that ean be charged to tin* iron proper.
When evils tint* to easting test bar?; flat are runsid ered as proven in Chapter LXV., on*- tMvaf e.ut'-e for the wide difference reeoniiMJ in th«" j*a-.t is i-leai'h' displayed. How is it possible to expert other than erratic and unreliable nvonls, when the far! of' a fiat east one-inch-area I erst bar beittj,* r»oo tn r\nn pnnnots stronger on one side* than tin* other is considered ^ Any one tfivintf thought, to this stibjert eanimt but perceive tin* unreliable records which casting ^^ »*»»•.t <\tust\ and become convinced that the plan of' e.r.tini1, on end far surpasses past methods, in ««nler lo insure uniformity between tensile and transverse or either tests taken from bars east off from the same ladle.
For foundry and engineering purposes if ran !«• --ai»l that tensile tests are often  valinbl*." fur   comparative"3.02™	3<4<L 2.0"