242 MR. W. H. BARLOW ON THE RESISTANCE OF FLEXURE IN BEAMS, ETC. 
Experiments on Direct Tension. 
Number of 
experiment. 
Sectional area at the 
place of fracture. 
Last weight sup- 
ported. 
Weight with which 
the bar broke. 
Remarks. 
1. 
inches. 
1-0506 
lbs. 
18,560 
lbs. 
18,840 
A small air-bubble. 
2. 
1-0557 
19,680 
19,960 
A small air-bubble. 
3. 
1-0100 
21,360 
21,500 
16,320 
A small air-bubble at corner, very small. 
4. 
1-0364 
16,320 
Honey-combed. 
5. 
1-0301 
17,440 
17,440 
Sound. 
6. 
1-0403 
16,320 
17,440 
A small air-bubble. 
7. 
1-0150 
21,640 
21,920 
Sound. 
8. 
1-0200 
22,200 
22,470 
Sound. 
Mean 
1-0323 
19,190 
19,486 
Mean greatest weight supported, per inch .... 18,590 lbs. 
Mean weight which broke the bar, per inch . . . 18,876 lbs. 
Considering the actual breaking weight to be between these two, and rather nearer 
the latter, when due allowance is made for the small air-bubbles, the mean breaking 
weight may be taken at 18,750 lbs. per square inch. 
