Arizona citizen., 1877-11-16
A Bridge for The Go.pnoru~.

While Turkey is in the throes of a
 bloody war two American engineers
 are planning a magnificent public work
 for her so soon as she returns to peace
 and peaceful arts. The leader ln the
 plans for bridging the Bosphorus is
 Captain Eads, whose fame is In the
 Misslssippi's mouth, and his associate is \. c. Lambert, an experienced bridgeI
 builder They plan a bridge about G,000 feet long-Over a mile. It will
 have 1j spans and will be 100 feet wide,
 and, save the masonry and flooring,
 will be built of iron. The night of the
 roadway above the surface of the water
 will be l20 feet, thus affording ample
 passage ways beneath the arches for
 ingoing and outgoing ships. twill bel
 observed that this elevation of thel
 bridge above the BC sphorus is some col feet less than that of the Brooklyn
 bridge above the East river, with theI difference that the latter is a suspension
 bridge, while the former will present al series of 15 bold arches thrown over the most attractive waterscape in the world, The greatest feat of engineering will
 be the bold central arch, 750 feet span over an eighth of mile. This is thel longest span ever contemplated, and its construction will necessitate the most careful labor and no small outlay of. money. In order 10 accomplish this single portion of the work alone, twOl caissOns will have to be sunk in OverI 100 feet of water; and this can only bel done by cofferdams and special contri-I vances, in their completeness yet un- known to engineering. The current at the point whero these piers will rest is very strong, coming through the Dar- danelles from the sea of Marmora, and rushing to the Black sea. The two cen | tral piers, constituting the backbone of the bridge, will be fifty feet thick, of solid granite blocks, locked together with iron braces. X side view of the | bridge will present, below the highest points of the arches, an intricate sys. l tenn of reinforce braces. Besides the main span of 75O feet, there will be two spans of 800 feet each adjoining the central one, and the distances between the arches will go on diminishing as the bridge approaches either shore un- til the arches reach the minimum width of 200 feet.
 By an invention of Captain Eads new feature will be introduced so that a train of cars, or anyLother heavy bur den, will not superimpose its weight at any one point over which it may be al the moment, but will be distributed the coco feet of the sup ports, thus making It an easy task to build an arch of 7j0 feet. This is &C., complished by uniting all the main bTacing from pier-head to pier-head, and connecting the minor rods, so that the whole forms a complete system, one brace dependent on the other. The action of heavy weights of troops marching to a common step, of rapid loeomotion by the cars, is thus instantly communicated through every foot of the supports, and every part is made to do its duty. Perhaps the mag nitude of the undertaking may be bet ter understood when it is stated that Inc main piers will be 27O feet high from the foundation to the summit It Is estimated that the cost of construc- lion will not exceed S25,000,000, and the time to complete it six years. It took about eight years to build the St. Louis bridge; but In the case of the projected one over the Bosphorus the conditions are very different. Excel ent granite can be found in desirable quantities near the place of construc- , ion and the labor will be very cheap.