Engineering and Contracting . bers are deepenough for vessels of 40 ft. draft. The locksat Gatun consist of three units, those at Mira-flores consist of two units and those at PedroMiguel consist of a single unit. The two andthree units forming the locks at Mirafloresand at Gatun are set end to end. forming acontinuous flight. The lock chamber dimen-sions given are the greatest of any canal locks laterals, except that each one is 33 sq. ft. inarea at the throat and is controlled by acylindrical valve at its junction with the mainculvert. This control makes the twin lockchambers independent. Th
Engineering and Contracting . bers are deepenough for vessels of 40 ft. draft. The locksat Gatun consist of three units, those at Mira-flores consist of two units and those at PedroMiguel consist of a single unit. The two andthree units forming the locks at Mirafloresand at Gatun are set end to end. forming acontinuous flight. The lock chamber dimen-sions given are the greatest of any canal locks laterals, except that each one is 33 sq. ft. inarea at the throat and is controlled by acylindrical valve at its junction with the mainculvert. This control makes the twin lockchambers independent. The longitudinal cul-verts are continuous the full length of eachlock flight. The culvert area is such that if all valves beopened at once the lock chambers can be filledor emptied in a very short time. The cur-rents set up above and below the locks and inthe lock chambers by fully opening all culvertsmight cause damage to vessels, however, andit was assumed that the water level in thelocks should not change to exceed 3 ft. per. Fig. 16. Diagram Plan of Pedro Miguel Locks and Dam. m the world, and are 100 ft. greater inlength and l-J ft. greater in width than wererecommended in The minority report of theInternational Board of Consulting Engineers. CEXER.\L DESCRIPTION. The location and arrangement of the threesets of Panama locks are indicated by Fig. 8and Figs. 16 and 17. The diagram 18 show the chamber dimenjions andthe location of gates, fender chains and emer-gency dams. Since the general structural fea-tures of all locks were the same they areshown onlv for one unit of the Gatun 10. The locks have concrete walls andfloors which are suitably recessed for gates,sills, etc. Where the locks are in flight, thewalls and floors are continuous. The centeror dividing walls are also in each case ex-tended from 1,000 to 1,200 ft. beyond the lockends to form guide and temporary mooringwalls. .•\11 lock masonry is founded on rockand in case of portions of the Gatu
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