STATE GEOLOGIST. 
method given in “Physical-Chemical Measurements” by Ostwald and 
Luther. No correction was made for heats of solution. The samples, 
having been ground in a porcelain ball-mill, were burnt in a Denver white- 
clay crucible. The amount of sample used varied from three to five 
CETTE A IE ORE ATID, 
7 
COOTER OD a 
74 
GOs 
prummtens, “ / 
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it GA ek 
i / om 
CF oy. 
o 4h Via 
; 7* G 
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a 7% ar: = KG 
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bs (OBL Ys 7 77/7 = R/ 
yA Cw 4 M4, 77S 7K 77 
ay, “0, ULL2 OC, Gy 77 
y et CIES, Wy ys 7, x —-§77 
oy, . DOE. Wer 7777s 77 
77 ae ELS OZ Le, ee 
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+A = 7% (A —j77 
iy, [rea EBEE WAL ssh Py & 
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oe: Se, LOB EGA 7y 
an LORLLA wa 
47 LD py 0). —_ s§ ——— 7 
7 7 LELL RBG: ing 
i OO | E/ - 
- 47 LUM Gy wee = | 1, 
ZI OD) C4477 TE } 
4, (a hehe vA Pe 47 
7 7 
, es 
7 Z, | 
7 7 
eT oe ne, 
oo 
: 77 
+A Z, 
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¥ 4 
A WATER Ze | 
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7 oN so ERI Reon ae | 
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4/ 
ee : saa 
Fig. 24. Calcrimeter, for measuring heats of hydration cf cements. 
grams, and an excess of water was used, 100 cc. The calorimetric work 
“was carried on in a basement room, excessive variations in temperature 
being thus avoided. Whenever any result was doubtful, a check deter- 
mination was made. 
The ground quartz (flint) showed the following mechanical analysis: 
Per cent. 
estdieronmel2 Ommeshestevicmenrene ei pean earns 1.40 
ResiducronmloMimesh sieves ae. corti snc canis se tees DESC 
lResicirexone2Z0O;meshusieviess sa tase haere oi eeris ee es 1.06 
