SPECIFICATIONS. 147 



167. Accepting Material or Work. The inspector shall stamp each piece accepted with a 

 private mark. Any piece not so marked may be rejected at any time, and at any stage of the 

 work. If the inspector, through an oversight or otherwise, has accepted material or work which 

 is defective or contrary to the specifications, this material, no matter in what stage of completion, 

 may be rejected by the purchaser. 



168. Shop Plans. The purchaser shall be furnished complete shop plans (13). 



169. Shipping Invoices. Complete copies of shipping invoices shall be furnished to the 

 purchaser with each shipment. 



FULL-SIZED TESTS. 



170. Test to Prove Workmanship. Full-sized tests on eye-bars and similar members, to 

 prove the workmanship, shall be made at the manufacturer's expense, and shall be paid for by 

 the purchaser at contract price, if the tests are satisfactory. If the tests are not satisfactory, the 

 members represented by them will be rejected. 



171. Eye-bar Tests. In eye-bar tests, the fracture shall be silky, the elongation in 10 ft., 

 including the fracture, shall be not less than 15 per cent; and the ultimate strength and true 

 elastic limit shall be recorded (141). 



ERECTION. 



172. If the contractor erects the bridge he shall, unless otherwise specified, furnish all staging 

 and falsework, erect and adjust all metal work, and shall frame and put in place all floor timbers, 

 guard timbers, trestle timbers, etc., complete ready for traffic. 



173. The contractor shall put in place all stone bolts and anchors for attaching the steel 

 work to the masonry. He shall drill all the necessary holes in the masonry, and set all bolts with 

 neat Portland cement. 



174. The erection will also include all necessary hauling from the railroad station, the un- 

 loading of the materials and their proper care until the erection is completed. 



175. Whenever new structures are to replace existing ones, the latter are to be carefully taken 

 awn and removed by the contractor to some place where the material can be hauled away. 



176. The contractor shall so conduct his work as not to interfere with traffic, interfere with 

 work of other contractors, or close any thoroughfare on land or water. 



177. The contractor shall assume all risks of accidents and damages to persons and properties 

 rior to the acceptance of the work. 



178. The contractor must remove all falsework, piling and other obstructions or unsightly 

 iterial produced by his operations. 



PAINTING AFTER ERECTION. 



.179. After the bridge is erected the metal work shall be thoroughly cleaned of mud, grease 

 1 other material, then thoroughly and evenly painted with two coats of paint of the kind specified 

 / the engineer, mixed with linseed oil. All recesses which may retain water, or through which 

 water can enter, must be filled with thick paint or some waterproof cement before the final painting. 

 The different coats of paint must be of distinctly different shades or colors, and one coat must 

 be allowed to dry thoroughly before the second coat is applied. All painting shall be done with 

 round brushes of the best quality obtainable on the market. The paint shall be delivered on the 

 work in the manufacturer's original packages and is subject to inspection. If tests made by the 

 inspector shows that the paint is adulterated, the paint will be rejected and the contractor shall 

 pay the cost of the analyses, and shall scrape off and thoroughly clean and repaint all material 

 that has been painted with the condemned paint. The paint shall not be thinned with anything 

 whatsoever; in cold weather the paint may be thinned by heating under the direction of the 

 inspector. No turpentine nor benzine shall be allowed on the work, except by the permission of 

 the inspector, and in such quantity as he shall allow. The inspector shall be notified when any 

 painting is to be done by the contractor, and no painting shall be done until the inspector has 

 approved the surface to which the paint is to be applied. Paint shall not be applied out of doors 

 in freezing, rainy, or misty weather, and all surfaces to which paint is to be applied shall be dry, 

 clean and warm. In cool weather the paint may be thinned by heating, and this may be required 

 by the inspector. 



REFERENCES. For the calculation of stresses in bridge trusses and plate girders, for 

 details of bridges, for the design of bridge details, and for additional examples of highway 

 bridges, see the author's " The Design of Highway Bridges." 





