Engineering and Contracting . ll is the cause of this and that thickness in. Loaded 2 in. off center. the bell. The first crack appeared in thebell at the top and extended 2 ft. into thebarrel at a load of 47,200 lbs. per lin. the maximum load of lbs. per this crack extended the full length of thebell section. No crack appeared in thespigot. Test discontinued. The effect of lateral restraint is illus-trated in the results of a preliminary teston Pipe No. 990. In this test the hydraulicjack machine was not used, but I-beamswere used to transfer the load from the6oo,ooo-
Engineering and Contracting . ll is the cause of this and that thickness in. Loaded 2 in. off center. the bell. The first crack appeared in thebell at the top and extended 2 ft. into thebarrel at a load of 47,200 lbs. per lin. the maximum load of lbs. per this crack extended the full length of thebell section. No crack appeared in thespigot. Test discontinued. The effect of lateral restraint is illus-trated in the results of a preliminary teston Pipe No. 990. In this test the hydraulicjack machine was not used, but I-beamswere used to transfer the load from the6oo,ooo-lb. testing machine to the saddle, 246 ENGINEERING-CONTRACTING \ol. XXIX. No. i«. since the box was too large to be placed bed of the machine. The distance ofthe saddle from the testing niachint: was:such that only one-fifth of the load on themachine was applied to the saddle. Theload was run up to 16,200 lbs. per lin. ft. onthe pipe. At tliis point an l-beani com-menced to buckle and the load was taken SSOQQr SOOfO -. 5 §~ !5 ^ 5 5Change ma/ameter5 in ins Fig. 4. En(grCDntr. •oft, .^t this load the cliangc in the verticaldiameter was in. The load havingbeen taken off, the rods holding the sidesof the box were loosened and kept looseand pressure again applied. This time, load of 15,500 lbs. per lin. ft., the averagechange in the vertical diameter was with no sign of failure. When the load SSOOPr-
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