CONCHETE CUBES.	611
Compressive Tests op Concrete Cubes.
Made of Akron Star cement.
Specimens furnished by William Wirt Clarke & Son, Baltimore, Md.
Ultimate strength.
Total.	Per square inch.
Pounds.	Pounds.
217,200	1,457
219,400	1,477
210,900	1,412
148,200	990
160,600	1,093
142,300	990
185,100	1,248
166,200	1,135
132,300	906
115,500	784
101,300	682
114,000	772
89,900	608
112,000	748
126,500	861
227,500	1,570
392,000	2,700
346,000	2,370
298,000	2,030
293,000	2,010
279,500	1,920
332,600	2,260
346,000	2,350
281,000	1,930
217,500	1,490
186,600	1,270
314,500	2,140
Sectional area.	Weight, total.	Weight per cubic foot.	First crack.
Sq. inches.	Lbs. ozs.	Pounds.	Pounds.
149. 07			
148.59			000׳216
149.41			191,000
149.69			
146.89			
143.75			
148.35			
146.40			
146.04			
147.38			
148.47			
147.74			
147.98			
149. 77			
147.00			
145.20	150 0	146.92	219,000
145.20	154 8	151.22	316,000
145.93	154 4	149.35	309,000
147.02	151 0	146.56	238,000
145.93	153 0	149.23	264,000
145.56	151 12	148.77	274,000
147.14	154 4	151.98	302,000
147.50	156 4	151.53	335.000
145.68	154 4	150.59	281,000
146.29	151 8	149.37	195,700
147.02	147 4	144.47	164,500
146.89	154 12	152.72 1	273,000
Dimensions.
Compressed
surface.
Inches. 12.08 12.10 12.08
12.17
12.04 12.08
12.12 12. 00 12.00
12.10 12.12 12.11
12.11 12.45 12.00
12.04 12.08 12.10
12.12 12.10 12.02
12.14
12.15
12.12
12.10 12.13 12.12
Inches.
12.84
12.28
12.42
12.30 12.20 11.90
12.24
12.20
12.17
12.18
12.25
12.20
12.22
12.03
12.25
12.06 12.02 12.06
12.13 12. 06 12.11
12.12
12.14
12.02
12.09 12.12 12.12
Height.
Inches. 12.12 12.17 12.10
12.05
12.13
12.12
12.20 12.12
12.13
12.00 12.00
11.96
11.96
12.15
12.12
12.15
12.16
12.23
Ì2.11
12.14
12.11
11.92 12.08
12.15
11.98
11.98
11.92
Age.
30 days.
....do..
----do..
..do... .do... .do...
.do... -do ... ..do...
.do ... .do ... .do...
.do... .do... .do...
7 months
---do ...
___do...
,.do....
, .do___
..do____
-do____
-do____
.do____
.do____
.do____
.do —
Composition.
Gravel.
Ce-
ment.
No. 1............
No. 1.............
No. 1.............
No. 2............
No. 2............
No. 2.............
No. 3.............
No. 3............
No. 3............
No. 4.............
No. 4.............
No. 4.............
No. 5..............
No. 5..............
No. 5.............
No. 1.............
No. 1.............
No. 1.............
No. 2..............
No. 2.............
No. 2.............
No. 3.............
No. 3.............
No. 3.............
No. 4..............!
No. 4..............
No. 4..............1