Fred T. Hodgson · Frederick J. Drake and Co. · leaf 380
5 203 203 590 590 161 161 550 640 150 175 5(K) 635 153 173 480 530 131 145 680 1040 186 284 840 1010 229 276 1280 1515 349 414 800 1375 218 375 Tested by i mpaet Form of reinforcement. 376 CEMENTS AND CONCRETES advantage over the barbed wire as a reinforcing material,particularly when two wires are… … First method of testing postsby impact NO. 17. has to withstand the force of a sudden blow or impact.In order to study the behavior of these posts under im-pact, a number of them were braced, as illustrated inNo. 17, and subjected to the blow of a 50-pound bag ofgravel, suspended from above by a…