STATE, GEOLOGIST. 207 
night. The objection to this test is that it is not an accurate one, and 
at best but comparative. Messrs. Newberry prepared the - following 
mixtures: 
(2CaO)SiO,. The clinker was vitrified, translucent and crystalline. 
On cooling, fell to a powder. Some of the pieces were quenched in 
water and these yielded a good cement, which stood the hot test. 
(2.5CaO)SiO,. Clinker white, somewhat vitrified. No sign of dust- 
ing. Pat showed very good setting quality, hardened slowly in water; 
decidedly hard after six weeks. Sound in steam test. 
(3CaO)SiO,. Clinker shrunken, slightly sintered; no dusting. No 
heating on hydration. Pat rather soft at seven days, hard at six weeks, 
Sound in hot test. 
(3.5CaO)SiO,. Clinker but slightly sintered; soft; no dusting. Pat 
set hard, but left glass, curved slightly, and cracked; became hard after 
several weeks in water. Sound in hot test. | 
In the following table the results of their tests have been arranged: 
Silicates. 
Composition. 
Ratio, 
Formula. CaO to Pat test. Hot test. 
0a | On), | SiO.. 
: [oe Ee 
2CaOSi0 , 1.85 | 65.11 | 34.89 | Set hard, hard 7 days, hard; Sound; on glass 
6 weeks. hard.” 
2.5CaOSi10 , 2.33 | 70.00 | 30.00 | Set soft, fair 7 days, hard | Same. 
6 weeks. 
3CaOSi0 , 2.80 | 73.68 | 26.32 | Set soft, fair 7 days, hard | Same. 
6 weeks. 
3.5CaOSi0 , 3.27 | 76.56 | 23.44 | Cracked, soft; hard 6 weeks} Same. 
The lime alumina compounds were likewise investigated by these 
experimenters and the following mixtures prepared, which were also 
burnt at a high-temperature : . 
(2.0CaO)AI,O,fused in direct heat, strongly clinkered in crucible; 
vitrified strongly. Set in a few seconds like plaster. The pat was hard, 
and on glass after six weeks. Hot test, on glass fairly hard, soft on 
inside. } 
(2.5CaO) Al,O,fused in direct heat, strongly clinkered in crucible; 
set quick. Pat off glass in one day; soft and cracked after six weeks. 
(3Ca®)Al,O,. Semi-fused in crucible. Powder heats strongly 
with water. Pat cracked before putting in water. Disintegrated entirely 
in water. Hot test, curved and cracked soft. 
