564 Mr. A. P. Carman on the 



Table II. 

 "Two-inch" Steel Tubes. Inside diameter 1*873 inches. 



Length 



t/d. 



Pressure of Collapse. 



Number of 



in inches. 



lb. per sq. in. 



Lobes. 



3-91 



•0245 



2870 



3 



3-88 



•0197 



1770 



3 



4- 



•015 



920 



3 



3-88 



•010 



350 



2 



594 



•0245 



2050 



3 



5-94 



•0197 



1280 



3 



5-94 



•015 



540 



3 



5-94 



•010 



150 



2 



7-8 



•0245 



1630 



2 



7-63 



•0197 



980 



2 



763 



•015 



515 



2 



7-66 



•010 



135 



2 



11-34 



•0245 



1080 



2 



11-34 



•0197 



590 



2 



11-34 



•015 



260 



2 



11-34 



•010 



70 



2 



15-13 



•0245 



960 



2 



1513 



•0197 



510 



2 



15-13 



•0150 



220 



2 



15-13 



•0099 



55 



2 



18-94 



•0245 



794 



2 



23- 



•0245 



780 



2 



27-8 



•02 i 5 



780 



2 



Table III. 



Three-inch" Steel Tubes. Inside diameter 2*87 inches. 



Length 



t/d. 



Pressure of Collapse. 



Number of 



in inches. 



lb. per sq. in. 



Lobes. 



5-88 



•0227 



2640 



4 



9-12 



•0227 



1960 



3 or 4 



12-14 



•0227 



1390 



2 



12-17 



•0227 



1040 



2 



12-19 



•0227 



1010 



2 



15-06 



•0227 



873 



2 



15-06 



•0227 



910 



2 



18-13 



•0227 



756 



2 



18-28 



•0227 



895 



2 



24-13 



•0227 



684 



2 



24-25 



•0227 



770 



2 



agreement between the observed and calculated curves for 

 lengths less than six diameters. In figs. 4, 5, and 6, we 

 have the observed and calculated curves for lengths less than 



? 



