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Full text of "Metallurgy Of Cast Iron"

STKKNUTH    IN    SIM-A! i A LT V    M1XTURKS.
467
Having completed the record of tests, it  is now in
order to learn what they prove. It will require but little study of the Tables to find that the siruill bars do not record any true variation in degrees of strength, nu mailer what quality of iron is used. They assert that 141111 metal, ehill roll, ear wheel and heavy machinery are no stronger than li^ht machinery or soft grades of irons. Any one experienced in the handling or use of east iron knows that the first four grades of iron are stronger and have a higher commercial value for strength than the fifth one.
To further illustrate the impracticability of usim^ bars below one square inch area, we show an average of the strength of the one-half inch square and one and one-eighth inch round roiij^h bars of all such tests n in this Chapter in the following1 Table 97 :
TAIILK     <J7STK<iN;   IKONS.
Average nf i * >'i in. round bars.
,',,'iKfi pounds.
......,.......,,,.,I,itflit iJiarhtiin v....................
,.......................SttiVf   pl:it(V............,............
verage of t >,', Ln. loiiud bars.
pounds.
It i\*tnnot bul !> })lain from tin- averages in Table 97 that the half inrli sipiap.1 bar is a si/,e readily af-ft-rtrd by llu* least i'lian;.;1' ii llu* dani])iH'SS of sands orn be seen in Fig.ioi on page 473.