511
Remarks.
CEMENT--RETARDED SETS. .
STAR PORTLAND CEMENT, WITHOUT PLASTER—Continued.
Hours.	Dimensions,			Sectional area.	First crack.	Compressive strength.	
	Height.	Compressed surface.				Total.	Per square inch.
	Inches.	Inches.	Inches.	Sq. inches.	Pounds.	Pounds.	Pounds.
56	4.00	3.94	4.08	16.16		21,900	1,355
56	4.02	3.94	4.09	16.12		20,100	1,247
58	4.00	3.93	4.07	16.00		19,300	1,206
58	4.05	3.95	4.07	16.08		16,600	],032
60	4.00	3.94	4.02	15.84		17,200	1,086
60	4.01	3.95	4.02	15.88		18,000	1,134
62	3.94	4.00	4.04	16.16		18,900	1,170
62	3.93	4.03	4.01	16.16		19,500	1,207
64	3.95	4.03	4.00	16.12		19,000	1,179
64	3.96	4.05	4.00	16.20		18,900	1,167
66	4.00	3.98	4.02	16.00		15,500	969
66	3.97	4.04	4.07	16.44		14,400	876
68	3.97	4.04	3.99	16.12		13,800	856
68	4.00	4.00	3.98	15.92		13,200	829
70	4.01	4.07	4.00	16.28		14,000	860
70	3.98	4.07	3.93	16.00		13,400	838
72	4.00	4.00	3.90	15.60		11,900	763
72	4.02	3.98	3.93	15.64		13,200	844
74	4.01	4.00	4.00	16.00		14,100	881
74	4.00	4.03	4.00	16.12		13,100	813
76	4.05	4.00	3.96	15.84		13,800 .	871
76	4.08	4.00	4.00	16.00		13,500	844
78	4.00	4.00	3.96	15.84		13,400	846
78	4.07	3.96	4.01	15.88		. 13,000	819
80	3.95	4.01	4.11	16.48		14,100	850
80	4.00	3.96	4.10	16.24		13,200	813
82	3.93	4.05	4.08	16.52		13,300	805
82	4.03	3.96	4.11	16.28		13,500	829
84	4.02	3.96	4.03	15.96		11,200	702
84	3.96	4.05	4.09	16.56		14,400	870
86	4.05	3.97	4.06	16.12		13,700.	850
86	3.95	4.00	4.08	16.32		14,500	888
88	3.96	3.99	4.01	16.00		14,200	888
88	3.99	3.99	4.07	16.24		12,500	770
90	4.01	3.94	4.05	15.96		12,700	796
90	4.03	3.98	4.06	16.16		12,400	767
92	3.95	4.02	4.09	16.44		13,300	809
92	3.92	4.02	4.03	16.20		14,500	895
94	3.94	4.00	4.00	16.00		14,100	881
94	4.00	3.93	4.01	15.76		13,200	838
96	3.93	4.01	4.06	16,28		14,600	897
96	4.02	3.95	4.02	15.88		12,500	787
98	4.03	3.95	4.05	16.00		12,800	800
98	4.02	3.94	4.01	15.80		12,500	791
100	4.02	4.00	4.00	16.00		12,100	756
100	4.00	4.00	4.01	16.04		11,500	717
102	3.98	4.08	3.98	16.24		13,900	856
102	4.00	4.07	4.00	16.28		12,200	749