556	CEMENT---SET AT DIFFERENT TEMPERATURES
DETAILS OF COMPRESSION TESTS OF SPECIMENS EXPOSED TO 39° F. TEMPERATURE WHILE SETTING, AND SUBSEQUENTLY AT 70° F.—Continued.
Composition.			Time of setting in air at temperature of—	
Ce- ment.	Sand.	Water.	39° F.	70° F.
Neat.		Per cent. 38.2	Days. 30	Days. 7
				
				
				
				
Neat.		38.2	30	30
				
				
				
				
Neat.		38.2	91	0
				
				
				
				
Neat.		38.2	91	7
				
				
				
				
Neat.		38.2	91	14
				
				
				
				
Neat.		36.2	30	0
				
				
				
				
Comer gone.
Ultimate strength.
Height.	Compressed surface.		area.	Total.	Per square inch.	Mean.
Inches.	Inches.	Inches.	Sq. inches.	Pounds.	Pounds.	Pounds.
2.06	2.03	2.05	4.16	• 2,500	601	
2.05	2.03	2.05	4.16	3,490	839	
2.05	2.02	2.05	4.14	3,470	838	
2.05	2.04	2.06	4.20	3,140	748	
2.06	2.04	2.08	4.24	3,010	710	747
2.04	2.03	2.01	4.08	5,010	1,230	
2.04	2.02	2.04	4.12	5,420	1,320	
2.02	2.03	2.01	4.08	3,840	941	
2.02	2.05	2.01	4.12	5,500	1,330	
2.03	2.04	2.00	4.08	4,530	1,110	1,190
2.04	2.05	2.03	4.16	4,800	1,150	
2. 04	2.02	2.05	4.14	4,710	1,140	
2.04	2.03	2.00	4.06	5,110	1,260	
2.02	1.99	2.06	4.10	4,230	1,030	
2.05	2.07	2.02	4.18	3,900	933	1,100
2.07	2.06	2.02	4.16	4,910	1,180	
2.04	2.05	2. 02	4.14	4,690	1,130	
2.03	2.06	2.09	4.31	5,010	1,160	
2.04	2.01	2.10	4.22	5,490	1,300	
2.01	2.10	2.02	4.24	5,000	1,180	1,190
2.02	2.08	2.00	4.16	5,810	1,400	
2.00	2.04	2.02	4.12	6,110	1,480	
2.04	2.08	2.03	4.22	5,700	1,350	
2.03	2.00	2.10	4.20	6,100	1,450	
2.05	2.04	2.03	4.14	6,210	1,500	1,440
2.00	1.98	2.03	4.02	4,480	1,110	
1.98	2.00	2.04	4.08	4,600	1,130	
2.00	1.97	2.01	3.96	4,740	1,200	
2.02	1.99	2.04	4.06	4,460	1,100	
1.99	1.99	2.04	4.06	4,020	990	i,iió
Dimensions.
3rand of cement.
Norton .
Obelisk .
Marks.
N. J. 21 .
N. J.21 .
O. F. 16.