for eye-bar cables, because with the former, the process, while tedious, is not at all complicated. Before the erection of the eye-bar chains is begun, it is necessary to string across from anchorage to anchorage and over the tower tops several lines of small wire cables. These have to be used in order to carry the first few lines of bars until the latter can be made self-supporting; and although there will, of course, be some salvage on such erecting cables, their use will be quite expensive. Again, as the eye-bars will have to be placed on the pins by heating and shrinking, it is evident that the process is necessarily a slow one, requiring considerable apparatus; hence the erection cost will run high. The total cost of erection, therefore, is larger for the eye-bar cables not only because of the higher unit cost of manipulation but also on account of the greater weight of metal to be put in place.

Fourth. The lowest point in the catenary of the wire cables can be located very close to the top surface of the deck, thus making the height and the cost of the tower columns a minimum. Owing to the necessity for keeping the bottom chords of the crescent trusses above the elevation of the floor, and because, for a fair comparison, the center lines of the pairs of eye-bar cables must coincide with those of the wire cables, it is necessary to raise the tops of the towers several feet, thus increasing not only the cost of the latter but also the length and cost of the backstays.

Fifth. Wire-cable bridges do not call for special wind chords for the lateral system; but in eye-bar-cable bridges, owing to the omission of special stiffening trusses, it is necessary to provide such chords; and this item is likely to be quite expensive.

Sixth. The pound price of the wire cables is comparatively high, being at present about twice as great as that for eye-bar cables of nickel steel.

Seventh. The attachment of the wires at the anchorages is both tedious and expensive, whilst that of the eye-bars is simple and expeditious.

Eighth. The wire cables require stiffening trusses; but the two tiers of eye-bar cables are in tension under all conditions of loading; and hence they can serve, without stiffening, as the compression chords of the crescent trusses which are formed by the addition to them of vertical posts and adjustable diagonals.

Ninth. There is an uncertainty in respect to stress distribution in the stiffening trusses of the wire-cable bridge that does not exist in the eye-bar-cable structure, although, strictly speaking, the adjustable diagonals in the latter involve a small amount of ambiguity in the division of the shear. All stresses in the eye-bar-cable bridges can be determined with accuracy by the established principles of statics, whilst those in the stifening trusses of wire-cable bridges are found approximately by several different theories based upon assumptions which are sometimes of more than doubtful accuracy; and, consequently, considerable uncertainty concerning the maximum stresses to be provided for is involved.

To as great an extent as practicable,  all of these governing conditions