1. 3-inch R. F. guns, tubes, jackets, locking hoops, breechblocks, and clips . 9

2. 6-inch R. F. guns, tubes, jackets, and breec^hblocks 35

3. 12-inch steel B. L. rifled mortar, tube and jacket 55

4. Steel castings for carriage work 59

5. Steel foldings, gun and carriage work 71

6. Cast iron / 81

7. Chemical analyses, cast and pig iron and steel Ill

8. Bronze 115

9. Steel for comparison of testing mat^hines 135

10. Steels, miscellaneous 139

11. Steel wire 145

12. Swivels 148

13. Helical springs 149

14. Jacketed bullets, resistance in .30-caliber rifle barrels 159

15. Roller bearines 173

16. Copper cylinders for pressure gauges 177

17. Proof stresses, piston rods, retraction ropes, counterweight chains 181

18. Sheet brass 182

19. Wheels for field carriages and limbers 183

20. Cordage 223

21. Railroad material 235

22. Endurance of rotating shafts 243

23. Tensile tests, metal of endurance shafts 263

24. Steel bars immersed in liquid air 289

25. Concrete and mortar columns 293

26. Cement subjected to cubic compression 389

27. Brick piers 393

28. Sand-lime bricks 415

29. Granite 419

30. Marble 423

31. Blue and brown print papers 426

32. Private tests 427



3-INCH R. F. GUNS.
SPECIMENS FROM TUBES, JACKETS, LOCKING HOOPS,
BREECH BIjOCKS, AND CLIPS.
3-rNOH R. F. GDN8.
Tube.
No. 8070.
Marks, bt,m

Diameter, ".605.
Sectional area, .20 square inch.
Gauged length, 2".
11



University of Wis,



Applied

loads per

square

inch.
Elongation
perinch.
Successive

elongation

perinch.
Permanent
net.
Successive

permanent

set.
Remarks.
Founds.
1,000
6,000
10,000
30.000
40,000
50,000
66.000
60,000
66,000
70,000
71,000
72,000
73,000
74,000
76,000
110,600


Inch.
0.
.00006
.00026
.00100

.ooia>

.00166
.00190
.00205
.00230
.00260
.00260
.00460
.00605
.01260
.01806


Inch.
0.
.00005
.00020
.00076
.00085
.00080
.00025
.00015
.00026
.00020

0.
