tS 
-] 
STATE GEOLOGIST. 
AGE TENSILE STRENGTHS 
Ss J 
1.72 
co 
| | 
lees 
Le 
lie 
G 451 
1.65 
RATIO: YoCALCIUM OXIDE TO % SILICA 
1,58 1.60 
Fig. 2. Tetmayer’s Curve, showing the tensile strength of various granulated slags, with 15 per cent. 
of calcium hydrate tested after 28 days in water 
1.45 
1.33 1.36 1.38 141 
ae LS 
1:26 
a ISF- 
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fo) 
w 
00 
50 
00 
ISO 
inp) (9) N N 
HON! BYWNOS YId SAGNNOd NI HLONZSYLS JTISNAL 
500 
450 
400 
Principles of Slag Formation.—The formation of slags has received 
great attention for a long time by metallurgical chemists. The principles 
of their formation and the methods used in their study are identical or 
closely analagous to the formation and study of cement silicates, and for 
that reason the following resume has been prepared. 
Beside the proper chemical composition of the slag which is neces- 
sary to remove the detrimental constituents of the ore by fusion the 
melting point of the slag is of extreme importance as well as the degree of 
liquidity on fusion. 
For purposes of comparison it might prove of value to marshal the 
different possible silicates in a table so that their relations to each other 
may be understood in which “RO” stands, in general, for any base, like 
calcium oxide, magnesium oxide, barium oxide, CUS. 8 
