Tests of large bridge columns. . ely the same as for stations 26-34. b Last run for bar 48 rejected on account of doubtful initial reading. Note.—Stations 26 to 52A on lattice bars give (±) elongations in inches in gauge length of 16 inches forrepetitions of loadings as shown in order to show effect on lattice bars. CHECK READINGS, STATIONS 1 TO 4 [8-inch Berry Guage on Outer Point of Angles at Center of 80-inch Rods] Time Load,pounds Load inpounds persquareinch 1 2 3 4 July 13: July 14: 76 260 86 00076 260 1000 11301000 . . .
Tests of large bridge columns. . ely the same as for stations 26-34. b Last run for bar 48 rejected on account of doubtful initial reading. Note.—Stations 26 to 52A on lattice bars give (±) elongations in inches in gauge length of 16 inches forrepetitions of loadings as shown in order to show effect on lattice bars. CHECK READINGS, STATIONS 1 TO 4 [8-inch Berry Guage on Outer Point of Angles at Center of 80-inch Rods] Time Load,pounds Load inpounds persquareinch 1 2 3 4 July 13: July 14: 76 260 86 00076 260 1000 11301000 . . . . Standard bar Standard bar bar Note.—Stations 1 to 4 give compressions in inches in gauge length of 80 inches for various repetitions ofloadings. Tests of Large Bridge Columns 51 c 1 Sri \ i! II 1 i i i . im 1ij ! ! iV^il! 1 ! f 11 $ ! i s :fc : ;m . 1 .Il !1 ;i|; | it 1 1 -z \— 1— -, Till - ^ — mi • fir* i f 1 \ 1. iii . iii t: ? ? 8 ; ? a: L-jJll-J 1 1 1 t 1 1 1 —1. Sast Face West Face South Face North Face Fig. 15.—Column 34CS1 (chrome steel). Key to stations on Table IS 52 Technologic Papers of the Bureau of Standards TABLE 16.—Log of Test, Column US^S^ Carbon Steel [Cumulative (±) Elongations at Stations Below. Tested Jan. 27,1914. Time of Test, 10 a. m. to 12 m.|| Load,pounds Load inpounds persquare inch 1 2 3 4 5 6 7 8 9 10 55 170275 850551 700827 550965 500 1000 5000 10 000 15 000 17 500 20 000 22 50025 00027 50030 000 33 600 34 300 32 700 33 500 23 200 0 —.1000— .1190 0 0 -^. 0 —. 0 0 —. 0 0 0 0 1 103 4001 241 300 1 379 2501 517 200 -
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