Before closing this chapter the author has decided that it will be well to take two pending cases from his own practice and indicate how they should be solved. One is that of the crossing of Havana Harbor, Cuba, so as to develop a tract of beautifully-situated and almost-entirely unoccupied land about five miles long and one mile wide paralleling the coast line. Some seven years ago the author spent considerable time and money on the development of the project to build a high-level, cantilever, highway-and-street-railway bridge over the entrance channel near the inner end of Cabaña Castle at a location quite close to the place where the said channel expands into the body of the gourd-shaped bay forming the anchorage-ground of the harbor. Just as the project was about to materialize, the war in Europe began; and ever since then it has been impracticable to raise money for any large enterprise not directly connected with war work. However, the time is probably close at hand when it will be advisable to try to revive the scheme, because sooner or later a bridge of some kind will certainly be built across the channel so as to permit the city to expand in the one possible direction that will permit of the building of fine residences within quick reach of the business center. The old layout, shown in < href="PageE333.htm">Fig. 32f, necessitated the carrying of all traffic from an elevation of five feet above water level on the city side by means of a spiral approach and passenger elevators to an elevation of two hundred and four feet above the same, and then down to an elevation of about one hundred and fifty feet at the entrance to the North approach.

About a year ago, it struck the author that it might be better to build a double-track transbordeur quite close to the mouth of the harbor and to carry the traffic across at an elevation of about eighty feet above the water. Near La Punta, the outermost land on the City side of the channel, there is a large area of open ground which rises gradually to an elevation of twenty-five or thirty feet some four or five blocks back from the water; and at the other side of the harbor, between Morro and Cabaña Castles, the elevation of the land is much lower than it is farther in. By starting with a trestle approach near the South end of the said open ground and rising on a four per cent grade, more or less, to within about five hundred feet of mid-channel, it would be practicable to attain the elevation just mentioned for the cage deck; and on the other side a short trestle with an easy up-grade would lead to the general surface of the ground back of the two castles. The length of span over the channel would. not be more than 800 feet; and, possibly, it might be a hundred feet shorter, thus making the travel of the cages only 800 or 900 feet. On that account it would not be economical to adopt the transverse travelers, because the time required for crossing is so short. It would pay better to widen the structure and put in another track or two, should the prospective traffic warrant it, especially as, on account of the great height of the overhead span, a large width of structure is necessary for resisting properly the overturning effect of the wind pressure, which  during  tropical  storms  is  likely  to  be  excessive.   In  order  to