SOME MIXTURES OF CAST IRON AND NICKEL. 111 
TABLE IV. Results reduced to bars \"x1". Distance between 
the supports 2’ 3”. 
Break- | Ulti- | Power o Rates of 
ing mate de- resisting strength 
weight | flection impact. Bar F 2 
(b) id) | (6xd) =1000 
xperiment VI. Bar F 1 without notches} 867 |0°315 | 273 | 1000: 876 
D VII 
0. ar); 989 |0°38 | 376 |1000: 1000 
Dor VIE"... Gel with one notch. 760 |0°331 | 231 | 1000: 768 
Ds.0 EXiteG2 899 |0-41 | 368 | 1000: 908 
Do. >. ae H1 withtwonotches 746 |0°286 | 213 | 1000: 754 
Wor CTO Fale | » | 703 |o29 | 203 | 1000: 810 
Mearttiirr. costes. 829 |0'335 | 280 | 1000: 838 
I have been unable to ascertain the precise composition 
of these bars, but assuming it to have been similar to that 
of the first series of bars, the greater powers of resistance 
shown by them would seem to indicate that the nickel 
employed in their preparation possessed a higher degree 
of purity than that used for the first series. Much, how- 
ever, depends on the quality of the cast iron with which 
the nickel is mixed. The results derived from the fore- 
going experiments are conclusive, both in regard to 
those made on the first and those made on the second 
series of bars. Further experiments may, however, lead 
to different results; but judging from what has already 
been done, I am inclined to believe that chemical combi- 
nations of a different nature are required, and probably a 
totally different process of manufacture will have to be 
adopted before a sufficiently strong and satisfactory com- 
pound can be obtained. 
In attempting to ascertain the effect of a mixture of 
nickel with cast iron, the principal object was to determine 
to what extent the compound gave positive or negative re- 
sults. It is well known that meteoric iron is peculiarly 
ductile, and it was assumed that nickel, added to cast 
iron in such proportion as to produce a compound similar 
