THE IMPROVEMENT OF RIVERS. 



tested and accepted. Payment for timber will be per M. ft. B. M. ; for drift-bolts per 

 pound ; and for riprap per cubic yard, all measured as hereinbefore stated. 



IRON AND STEEL.* 



52. Extent. All iron and steel shall be furnished and set by the contractor, and 

 shall include all fittings for the lock-gates, such as bonnets, anchorages, straps, etc.; 

 all the gate and valve operating machinery; the valves and fittings; the ladders in 

 the lock walls; miter-sill and other bolts, and all other iron or steel shown or referred 

 to on the drawings or required as part of the permanent work. Iron and steel in the 

 temporary work will not be estimated, but must be furnished by the contractor at his 

 own expense. The contractor must supply whatever drawings may be needed in addi- 

 tion to those supplied by the United States. 



53. Setting Ironwork. All iron or steel work shall be set as shown on the draw- 

 ings, and all bolts shall be set with neat Portland cement. If not set as the work pro- 

 gresses, drilling the holes and setting the bolts must be done by the contractor at his 

 own expense. The contractor will be required to do, without charge, any necessary cut- 

 ting or facing in placing all iron and steel. 



54. Patterns. All patterns must be provided by the contractor, and shall become 

 the property of the United States. The price named for " Iron and Steel" must include 

 the expense of making the patterns, and of their delivery, in first-class condition, and 

 Defore the completion of the contract, at .............. 



55. Material. All structural steel shall be of the grade known as medium steel, 

 except forged work, which shall be of soft steel, and all tests and inspections shall be 

 made at place of manufacture prior to shipment. 



The tensile strength, limit of elasticity and ductility shall be determined from a 

 standard test-piece cut from the finished material. On tests cut from material other 

 than plates the test-piece may be planed or turned parallel throughout its entire length. 

 The elongation shall be measured on an original length of 8 inches, except when the 

 thickness of the finished material is T ^ inch or less, in which case the elongation shall be 

 measured in a length equal to sixteen times the thickness ; and except in rounds of f inch 

 or less in diameter, in which case the elongation shall be measured in length equal to eight 

 times the diameter of section tested. Material which is to be used without annealing 

 or further treatment is to be tested in the condition in which it comes from the rolls. 

 When material is to be annealed or otherwise treated before use, the specimen repre- 

 senting such material is to be similarly treated before testing. 



Every finished piece of steel shall be stamped with the blow or melt number. 

 Rivet steel and small pieces may be shipped in bundles securely wired together, with 

 the blow or melt number on a metal tag attache 1 . 



*Adapted from the Standard Specifications of Iron and Steel Manufacturers. 



