200 feet long transverse to the stream; and, on each side of this, a 700-foot span with a cantilevered end extending out 400 feet beyond a supporting pier, on which is a rocker-bent that is stiffened laterally by means of two triangular-braced frames. The inclined legs thereof connect to the ends of the cantilever arms of a very deep steel-girder, encased in concrete, that joins the two concrete cylinders of which the pier is composed. There is a similar arrangement of bracing at each of the piers near mid-channel. The outer end of each of the 400-foot spans rests on a roller bearing directly above the end columns of a steel-trestle approach, being anchored thereto so as to prevent any uplift. Of course there can be no bracing in the central portion of any one of the braced towers, because the ferry cars or cages have to pass through that space. The trusses are 100 feet deep; and they are braced across between chords in both horizontal and vertical planes, so as to stiffen them thoroughly. The long-type cages, of which there are six, are about 100 feet long and 25 feet wide from out to out. They will carry on one side of their lower deck a line of track long enough for two street-cars, and along- side of these there will be space for five or six wagons, or eight automobiles, or five motor trucks. The cage is to be double-decked, the upper deck being for pedestrians and covered with a roof; the sides are to be open to permit the wind to blow through, but arrangement must be made to cover the upper portions of them, occupied by the pedestrians, in case of rainy or cold weather. The cages are suspended by rigid frames braced on all four faces-completely at the sides, and at the ends to within about 8 feet of the top of the upper deck. These cages are hung by trucks, the wheels of which roll on rails supported by the bottom flanges of stringers. In order to avoid delay, the cars are always to be suspended from overhead, and are not to be carried by tracks on the approaches at the level of the platform. Near the outer end of each trestle, there is a pair of independent travelers running on overhead transverse tracks.

At each end of the structure there are four pockets, two for operation and two for storage. The latter have overhead stringers for carrying the wheels of the traveling cages.

The modus operandi is as follows:

At the end of the structure shown on the left in Fig. 32a, a traveling cage comes along "Track A" and passes into "Traveler A," which is immediately moved outward into "Pocket A." At once "Traveler B" is moved so as to face "Track A," from which it receives the next incoming cage, and then moves into "Pocket B." Meanwhile the street car, the vehicles, and the pedestrians of the first cage have passed out to the left, as indicated by the arrow, and the cage is again filled by a car, vehicles, and pedestrians coming in from the right, as shown by the arrow adjacent to the curved center-line of street-railway track. Then "Traveler A" moves  over  to  face  "Track  B,"  and  the  cage with its contents starts back across  the  structure,   immediately   after   which   "Traveler  A"  moves  over