operator stand in a bow-window of the machinery-house so as to command a view of the river in both directions.

4.   Omit the water-tanks as an unnecessary precaution, and rely on the great capacity of the electric motors to overcome any temporary unbalanced load.

5.   A simpler and less expensive adjustment at feet of rear columns.

6.   Cast steel instead of cast iron for all machinery.

7.   Catch the balancing chains ins buckets placed on top of the span instead of hanging them to the counterweights.

The author has designed a rather peculiar lift-bridge for a crossing of the Missouri River at Kansas City, Mo., at the site of the unfinished Winner Bridge, the piers for which have been completed for over six years. The proposed superstructure will provide for two railway-tracks on each deck, a single-track wagonway outside of each truss below, and a footwalk outside of each wagonway. The perpendicular distance between central planes of trusses is to be thirty-two feet.

The requirements of navigation will be provided for by means of a lifting deck in the second channel span from the Kansas City side, suspended from a through overhead span. This span will be supported on steel columns carried by the existing masonry piers, which will have to be cut down to about the elevation of standard high water, then rebuilt for two or three courses. At one end of the supporting span the vertical end posts are made fast to the bent posts below by means of a pin connection, but at the other end there is to be a nest of friction-rollers between the foot of each vertical end post and the top of the bent column beneath. These bents are to be stayed to the inclined end posts of the adjoining spans.

The lifting deck will consist of four lines of railway plate-girder stringers and four lines of open-webbed highway stringers, with an effective system off horizontal and vertical sway-bracing between the stringers of each pair, besides a very rigid lateral system attached to the lower flanges of all stringers. All of these stringers will rivet up against the webs of the cross-girders, the elevations of the upper surfaces of all