AND LONG-CONTINUED CHANGES OE LOAD ON WROUGHT-IRON GIRDERS. 321 
Date. 
Number of changes 
of load. 
Deflection, in 
inches. 
Permanent set, 
in inches. 
Remarks. 
1860. 
August 9. 
158 
( 
The load during these changes was equi- 
valent to 10,500 lbs., or 4-6875 tons at the 
centre. With this weight the beam took 
a large but unmeasured set. 
Aug. 
11. 
12. 
12,950 
25,742 
0-22 
9 
During these changes the load on the 
beam was 8025 lbs., or 3-58 tons. 
Aug. 
13. 
25,900 
0-18 
0 
Load reduced to2 - 96tons, or^th of the 
16. 
46,326 
0-18 
0 
breaking-weight. 
20. 
71,000 
0-18 
0 
24. 
101,760 
0-18 
0 
yy 
25. 
107,000 
0-18 
0 
31. 
135,260 
0-18 
0-01 
Sept. 
1 . 
140,500 
0-18 
0-01 
8. 
189,500 
0-18 
0-01 
15. 
242,860 
' 0-18 
0-01 
99 
22. 
277,000 
0-18 
0-01 
30. 
320,000 
0-18 
0-01 
Oct. 
6. 
375,000 
0-18 
0-01 
13. 
429,000 
0-18 
0-01 
99 
20. 
484,000 
0-18 
0-01 
M 
27. 
538,000 
0-18 
0-01 
Nov. 
3. 
577,800 
0-18 
0-01 
■ 99 
10. 
617,800 
0-18 
0-01 
99 
17. 
657,500 
0-18 
0-01 
y 
23. 
712,300 
0-18 
0-01 
Dec. 
1 . 
768,100 
0-18 
0-01 
99 
8. 
821,970 
0-18 
0-01 
15. 
875,000 
0-18 
0-01 
22. 
929,470 
0-18 
0-01 
29. 
1,024,500 
0-18 
0-01 
1861. 
Jan. 
9. 
1,121,100 
0-18 
0-01 
99 
19. 
1,214,000 
0-18 
0-01 
99 
26. 
1,278,000 
0-18 
0-01 
Feb. 
2. 
1,342,800 
0-18 
0-01 
99 
11. 
1,426,000 
0-18 
0-01 
99 
16. 
1,485,000 
0-18 
0-01 
23. 
1,543,000 
0-18 
0-01 
Marcli 2. 
1,602,000 
0-18 
0-01 
99 
9. 
1,661,000 
0-18 
0-01 
J9 
16. 
1,720,000 
0-17 
0-01 
23. 
1,779,000 
0-17 
0-01 
33 
30. 
1,829,000 
0-17 
0-01 
April 
6. 
1,885,000 
0-17 
0-01 
13. 
1,945,000 
0-17 
0-01 
99 
20. 
2,000,000 
0-17 
0-01 
99 
27. 
2,059,000 
0-17 
0-01 
May 
4. 
2,110,000 
0-17 
0-01 
11. 
2,165,000 
0-17 
0-01 
99 
20. 
2,250,000 
0-17 
0-01 
Sept. 
4. 
2,727,754 
0-17 
0-01 
Oct. 
16. 
3,150,000 
0-17 
0-01 
2x2 
