CEMENT AND MOETAE CYLINDEES.	621
Compression Tests of Cement and Cement Mortar Molded and Retained in Stovepipes.
Materia] submitted by Mr. H. A. Carson, chief engineer Boston transit commission.
Sketch showing the disposition of bricks in specimens Nos. 17 and 18.
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Test No.	Marks.	Brand of cement.	Composition.			Age.		Dimensions.		Sectional area.	Ultimate strength.		Remarks.
			Cement.	Sand.				Height.	Diam- eter.		Total.	Per square inch.	
						Mos.	Bays.	Inches.	Inches.	Sq. inches.	Pounds.	Pounds.	
	15					3	16	30.47	8.19	52.68	231,000	4,380	
	16					3	16	30.10	8.15	52.17	292' 100	5', 600	
11444	17		1		1	3	15	30.73	8.14	52.04	177'400	3,410	14 bricks, per sketch.
11445	18		1		1	3	15	30.18	8.16	52.30	198,200	3,790	Do.
11446	21		1		1	3	15	30.16	8.15	52.17	255,800	4,900	
11447	22		1		1	3	15	30.25	8.16	52.30	234,400	4,480	
11448	25					3	9	28.16	5.93	27.62	254,100	9,200	Naked specimen.
11449	26		1		*	3	9	28.30	6.33	31.47	225,' 100	7; 150	
11450	27		1		1	3	9	28.10	6.10	29.22	193,000	6,630	
11451	28					3	6	28.35	6.10	29.22	212,400	7,270	
11452	29		Neat.			3	6	28.39	6.24	30.58	225,800	i, 380	
11453	31		1		1	3	6	28.32	6.28	30.97	138,600	4,480	
11454	33		1			3	6	28.32	5.99	28.18	155,000	5,500	Do.