CEMENT--RETARDED SETS.
516
Hours.	Dimensions.			Sectional area.		Compressive strength.		Remarks.
	Height.	Compressed surface.			First crack.	Total.	Per square inch.	
			Inches.	So. inches.	Pounds.	Pounds.	Pounds.	
20	3.99	4.05	4.08	16.52	47,400	51,500	3,117	
	3.97	4.06	4.07	16.52		52,400	3,172	Do.
22	3.99	4.07	4.05	16.48	41,800	50,100	3,040	Do.
22	3.97	4.01	3.97	15.92		46,600	2,927	Do.
	3.98	4.00	3.95	15.80		44,900	2,842 '	Do.
	4.03	3.97	4.01	15.92	41,100	42,300	2,657	Do.
26	3.99	4.09	3.98	15.28	48,800	52.200	3,416	Do.
26	3.98	4.10	3.98	16.32	43,200	43,200	2,647	Do.
28	4.09	3.99	4.02	16.04		48,400	3,018	Do.
28	3.98	4.04	4.00	16.16		44, C00	2,723	Do.
30	3.97	4.10	4.05	16.61		44,100	2,655	Do.
30	3.96	4.04	4.01	16.20	40,200	42,100	2,599	Do.
	4.04	3.97	4.00	15.88		39,600	2,494	Do.
32	3.98	4.05	4.05	16.40		42,500	2,592	Do.
34	3.98	4.06	4.01	16.28	36,400	37,100	2,279	Do.
34	3.98	4.09	4.01	16.40		40,200	2,451	Do.
	4.06	4.00	4.00	16.00		38,700	2,419	Do.
	4.05	3.98	3.99	15.88		35,200	2,217	Do.
38	3.99	4.10	3.99	16.36			43,100	2,635	Age 38 days.
38	4.10	3.97	4.01	15.92	40,100	41,700	2,619	Do.
40	4.06	3.98	4.00	15.92		34,200	2,148	Do.
40	3.98	4.08	3.97	16.20		33,600	2,074	Do.
42	4.05	3.98	4.04	16.08		27,300	1,698	Do.
42	3.98	4.06	3.99	16.20	32,000	34,500	2,130	Do.
44	4.06	3.98	3.99	15.88	27,600	28,900	1,788	Do.
44	3.98	4.02	3.99	16.04		38,400	2,394	Do.
46	4.04	4.00	3.98	15.92	30,300	31,300	1,966	Do.
46	4.00	4.03	4.00	16.12	27,700	28,700	1,780	Do.
48	4.01	3.96	3.95	15.64	28,700	30,100	1,925	Do.
48	3.96	4.03	3.96	15.96	28,700	29,600	1,855	Do.
50	4.04	3.98	3.99	15.88		34,400	2,166	Do.
50	3.97	4.00	4.01	16.04	30,200	30,700	1,914	Do.
52	4.04	3.98	4.00	15.92		30,400	1,910	Do.
52	3.97	4.01	3.97	15.92	29,600	30,100	1,891	Do.
54	3.99	3.97	3.96	15.72		28,800	1,832	Do.
54	3.96	4.06	3.99	16.20	23,600	27,300	1,685	Do.
56	3.94	4.04	4.03	16.28	29,500	32,400	1.990	Do.
56	4.04	3.96	3.99	15.80	24,200	26, 700	1,690	Do.
58	4.00	3.95	4.02	15.88	24,600,	i 26,600	1,675	Do.
58	4.04	3.95	4.02	15.88	24,800	25,500	1,606	
60	3.97	4.09	3.98	16.28	23,000	23,300	I 1,431	Do.
60	4.07	3.97	3.95	15.68		20,700	1,320	Do.
62	3.97	4.02	4.00	16.04	22,400	22,900	Ì 1,428	Do.
62	3.99	3.98	3.99	15.88		23,200	1,461	Do.
64	4.03	3.98	3.98	15.84	18,700	19,100	1,206	Do.
64	3.97	4.06	2.97	16.12	12,300	19,500	1,210	Do.