attached to the bridge, and rigidly braced. When the rigidity of a hand railing is dependent upon that of the outer joists, the latter must be properly bridged and stiffened. Any other wooden hand-railing of equal strength and rigidity, and which is satisfactory to the Engineer, will, however, be accepted.

When iron hand-railing is employed, it is to be of a firm, substantial pattern, pleasing to the eye, and rigidly attached to the trusses or floor-beams. Both through and deck bridges are to be provided with a hand-rail on each side, not less than three and a half (3 1/2) feet high above the floor. In case there be any liability of a horse jumping over this railing, its height must be increased to four and a half (4 1/2) or five (5) feet. There must be a hand-rail on the outside of each sidewalk, not less than three and a half (3 1/2) feet in height above the floor.

FLOORING ON APPROACHES.

All floor-timbers, guards, and railings shall extend over all piers and abutments, and make suitable connection with the embankments at the ends of the structure. Aprons or cover-joints of steel plate shall be provided at the ends of spans, if required. The floors of the sidewalks shall extend to and connect with the floor of the main roadway, so as to leave no open space between them.

STREET-RAILROAD TRACKS.

Should there be one or more street-railroad tracks crossing the bridge, there must be directly under each rail a joist or stringer, properly proportioned to resist the effect of the total maximum load on the rail; and the bending effect of the concentrated loads upon the floor-beams must be duly considered.

The rails shall be so laid as to offer as little obstruction as possible to the wheels of vehicles.

PAVED FLOORS.

Where paved floors are adopted, the pavement shall be of the best of its kind,  and  shall be built according to the latest