509
Remarks.
CEMENT--RETARDED SETS.
STAR PORTLAND CEMENT, WITH PLASTER—Continued.
Hours.	Dimensions.			Sectional Area.	First crack.	Compressive strength.	
	Height.	Compressed surface.				Total.	Per square inch.
		Inches.	Inches.	So. inches.	Pounds.	Pounds.	Pounds.
56	4.06	3.97	3.95	15.68	18,800	18,800	1,199
56	3.99	3.96	3.92	15.52	18,200	18,200	1,173
58	3.95	4.02	3.98	16.00	17,600	17,600	. 1,100
58	3.97	4.00	3.99	15.96	19,400	19,400	1,216
60	3.97	4.04	4.01	16.20	18,700	18,700	1,154
60	4.01	3.95	4.00	15.80	18,100	18,100	1,146
62	3.96	4.02	4.00	16.08	17,100	17,100	1,063
62	3.96	4.00	3.97	15.88	18,400	18,400	1,159
64	3.96	4.00	3.98	15.92	18,500	18,500	1,162
64	3.97	4.02	3.96	15.92	17,100	17,100	1,074
66	4.00	3.95	3.95	15. 60	17,800	17,800	1,141
66	3.95	4.02	3.96	15.92	16,500	16,500	1,036
68	3.96	4.01	4.07	16.32	16,900	16,900	1,036
68	4.09	3.98	3.99	15.88	13,800	13,800	869
70	3.96	4.03		16.32	17,700	17,700	1,085
70	4.01	3.94	4.04	15.92	14,600	14,600	917
72	4.07	3.95	3.96	15.64	14,300	14,300	914
72	3.97	4.07	3.99	16.24	15,200	15,200	936
74	4.03	3.96	3.96	15.68	14,800	14,800	944
74	4.03	3.92	4.01	15.72	14,400	14,400	916
76	3.98	4.02	3.99	16.04	17,300	17,300	1,079
76	4.00	3.94	4.01	15.80	13,700	13,700	867
78	4.01	3.98	4.05	16.12	14,100	14,100	875
78	4.05	3.96	4.06	16.08	15,200	15,200	945
80	3.96	4.07	4.04	16.44	12,600	12,600	766
80	3.97	4.10	3.98	16.32	12,400	12,400	760
82	3.96	4.08	4.00	16.32	13,800	13,800	846
82	3.97	4.06	3.97	16.12	15,100	15,100	937
84	4.00	3.96	3.97	15.72		12,500	795
84	3.98	4.03	3.99	16.08		14,500	902
86	4.01	3.98	4.02	16.00		10,600	663
86	4.01	3.96	4.03	15.96		12,200	764
88	4.02	4.00	3.94	15.76		12,700	806
88	4.03	4.00	3.96	15.84		14,500	915
90	4.09	4.00	4.02	16.08		9,900	616
90	4.08	4.00	4.01	16.04		13,300	829
92	4.05	4.00	3.99	15.96		13,000	815
92	4.05	3.99	3.97	15.84		9,300	587
94	3.99	4.03	3.94	15.88		13,200	831
94	4.00	4.00	3.92	15.68		11,400	727
96	4.06	4.00	3.97	15.88		12,300	775
96	4.09	4.00	3.99	15.96		11,000	689
				15.96		9,100	570
98	4! 00	3.99	3.99	15.92		9,400	590
100	3.97	4.00	4.03	16.12	10,300	10,300	639
				15.92		11,500	722
				16.24		10,800	665
102	4! Ò0	3! 96	4.08	16.16			11,100	687