All threads, except those on the ends of pins, must be of the United States standard. Each adjusting nut must be provided with an effective nut-lock or check-washer.

ROLLERS.

Rollers shall be turned accurately to a gauge, and must be finished perfectly round, and to the correct diameter or diameters, from end to end. The tongues and grooves in plates and rollers must fit snugly, so as to prevent lateral motion. Roller-beds must be planed.

ANCHOR-BOLTS.

All bed-plates and bearings must be fox-bolted to the masonry or attached to concrete by anchor-plates. The Contractor must furnish all bolts, drill all holes, and set the bolts to place with Portland-cement grouting.

All anchor-bolts are to be of soft steel with cold-pressed threads; and the threaded portion of all such bolts tested to destruction shall develop a greater strength than that of the unthreaded portion of same. The lengths of the nuts for all adjustable rods must always be great enough to develop the full strength of the rod.

All anchor-bolts are to be thoroughly oiled but not painted before shipment; and the exposed portions thereof, after erection, are to receive two coats of paint at the same time the rest of the metal-work receives its two coats.

NAME-PLATES.

A name-plate of neat design and finish, giving the name of the Contractor and the date of erection, shall be firmly attached to each end of every through-bridge, and to some prominent place or places in all other structures.

PAINTING.

All metal-work before leaving the shop shall be thoroughly cleansed from all loose scale, rust, and dirt,  and shall then be