Engineering et de passation . nécessaire d'être très-ful garde à ne pas casser les pavés, mais avec un peu d'carethis a été facilement évité et la goulotte de remplissage, chauffé à la maxi-mum degré, a été placé de façon très satisfaisante. Un roman 276 LIFTBRIDGE À COMMANDE ÉLECTRIQUE. Contribué par Frank C. Perkins. Buffalo, N. Y. Les illustrations montrent les détails de con-struction de l'unique ascenseur Pont sur le ArkansasRiver à Pine Bluff, Ark., tel que conçu à Kansas City, Mo., par des ingénieurs Ira G. Hedrick et Victor H. Cochrane.L'utilisation de machines électriques est très simple comme ateach coin de th

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Engineering and Contracting . necessary to be very care-ful not to crack the paving blocks, but with a little carethis was easily avoided and the filler, heated to the maxi-mum degree, was placed very satisfactorily. 276 A NOVEL ELECTRICALLY OPERATED LIFTBRIDGE. Contributed by Frank C. Perkins. Buffalo, N. Y. The accompanying illustrations show the details of con-struction of the unique lift bridge over the ArkansasRiver at Pine Bluff, Ark., as designed at Kansas City, Mo., by Engineers Ira G. Hedrick and Victor H. Cochrane.The electric operating machinery is quite simple as ateach corner of the span there are two heavy sprocketchains attached at one end of the top of the tower postsa short distance below the top of the top chords. Theseoperating chains are attached to horizontal links to equal-ize the stresses and are provided with bolts at top andbottom to adjust the position of the chains and to regu-late the tension. At a point a little above the top chordeach part of sprocket chains is lopped back towards the. ENGINE i: RINGAND COXTRACTIXG THE ERECTION OF THE SUSPENDED SPANNEW QUEBEC BRIDGE. Contributed by G. V. Davles and N. C. McMath. Assistant EngineersSt. Lawrence Bridge Co., Limited. There will be four stages in the erection of the sus-pended span of the new Quebec bridge, as follows: (1)The placing and loading of the scows under the span; (2)towing the span into position under the two cantileverarms; f3) hitching on and lifting by jacks, and (4) thefinal connections to the cantilever arms. The suspended span has been erected on steel falseworkat Fillery, a village about three miles below the bridgesite, on a large flat, which is usually bare at low tide, butwith sufficient depth of water at high tide to float the spanwhen the scows are in place. The span will be floated on six steel framed, timbersheeted scows, each 164 ft. 6 in. long, 32 ft. wide and 11 ft.7^4 in. deep, with a capacity of appro.ximately 1, 000 tons. The load on each scow is carried by four

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