Second. See that the metal-work goes together properly and expeditiously, and report to the Engineer all necessity for chipping or filing on account of bad shop-work.

Third. Watch carefully the riveting to see that no burnt rivets are used, that all field-rivets are driven in accordance with the specifications, and that no loose rivets are left in the work.

Fourth. See that all vacant spaces in the metal-work are completely filled with paint-skins or other water-proof material before the painting is begun.

Fifth. In elevated-railroad work see that during the erection of the metal-work the lengths of the girders are sufficiently correct to prevent all possibility of using up the spaces provided for expansion, assuming the greatest temperature of the metal to be one hundred and twenty-five degrees. See also that the expansion and contraction of the structure cannot injure the stairways.

Sixth. In drawbridges, see that the masonry of the pivot-pier is levelled off with the greatest accuracy, and that the lower track-segments are set to exact position and level, thus making a perfectly conical surface for the rollers. See also that the latter are adjusted so as to bear evenly at top and bottom against both upper and lower track-segments.

Seventh. See that the ends of draw-spans are properly adjusted by means of the shimming-plates on the rest piers and those in the bottom chords near the pivot-pier. Make sure that in every particular the draw is reversible end for end; and see that all shafting is properly aligned so that there will be no binding in any of the bearings.

Eighth. See that, before the operating machinery is tested, all sliding or rolling surfaces are thoroughly lubricated, and that the turntable is cleared of all obstructions, such as nails, etc., on the lower track-segments. Then make a test of the machinery and compute therefrom the horse-power required to operate the draw.

Ninth. See that all anchor-bolts are set in exact position and to correct level, and that they are properly grouted in.

Tenth. In placing the bearings for arches, take the great-