the Contractor is informed as to what piece the samples are taken from, so that he can make a check test, if he so desire.

Fifth. See that all the various tests indicated in the specifications are made faithfully, the number of same depending upon the relative uniformity of the metal furnished.

Sixth. Make sure that all the punching is done with such care that the assembled parts will come together so as to make the rivet-holes match so accurately that when the reaming is finished there shall be no irregular holes.

Seventh. Make sure that all pieces are cut to exact length and proper bevel, that all web-stiffening angles bear perfectly at top and bottom against flange angles, and that there are no loose rivets.

Eighth. Wherever rivets with flattened heads or countersunk rivets are called for, make sure that they are properly chipped or otherwise brought to correct dimensions; also see that the ends of all members are limited to the lengths beyond the last rivet or pin hole shown on the drawings. Give particular attention to the ends of all posts and chord-members to see that the "over-all" and the clear dimensions between jaws correspond faithfully to those indicated on the drawings.

Ninth. Take some effective means of ensuring that the entire work shall go together properly and without difficulty during erection, and so that when completed it shall conform in every particular with the Engineer's design, even if, to accomplish the same, it be necessary in special cases to assemble the entire work at the shops.

Tenth. Watch carefully the punching and handling of the metal in the shops, so as to see that no cracks develop therein, and that the metal withstands properly the manipulation, showing as perfect homogeneity as is found in the best structural steel.

Eleventh. Condemn, as soon as it is discovered, any material unfit in the slightest degree for use in the structure, no matter how many times it may have already been inspected and passed.

Twelfth. See that all metal-work is properly cleaned by the most approved methods and apparatus before the first coat of