72 Plan of the Locks at Cincinnati, Ohio. 



Around each lock, the water for the supply of the canal, is carri- 

 ed in a canal for that purpose j and near the foot, it tumbles over a 

 breast of masonry, into the basin below. This tumble is connected 

 with the lock walls, and from below, exhibits the appearance of a 

 double lock. Recesses are made in the sides of the tumble for the 

 insertion of plank to regulate the supply of water. 



The lock gates are constructed of timber in the usual manner, con- 

 sisting of a coin and mitre post, connected together by ties or arms. 

 On the top of these posts, rest^ a large lever or balance beam, which 

 serves to keep the gate balanced, and by means of which the gate is 

 opened and shut. The- gates lap two inches and a half below the 

 top of the mitre sill, but the coin post extends to within an inch of 

 the floor. In the lower end of this post is inserted the cast iron sock- 

 et, «, Fig. 1, and secured by a band of ironj the step b, Fig. 1, is 

 let into the floor, in the centre of the hollow coin, and fastened with 

 spikes, on which the gate turns. The arms are more firmly secured 

 to the coin post by Ts and Ls, connected by bolts with screws. 

 To the mitre post, the arms (except the lower one) are connected 

 by a dove-tail tenon and key, reaching through the post. The up- 

 per and lower arms only, are secured to the mitre post with Ts and 

 Ls. . The end of the balance beam is secured to the mitre post by 

 a strap of iron passing over it, and extending down on each side of 

 the post, and connected by bolts and screws. This end of the beam 

 is also banded, to prevent it from being split by the concussion of 

 boats. The beam is fastened to the coin post to prevent it from ri- 

 sing by the high water. That part of the beam which lies over the 

 gate is left square on the top, so that when the gates are shut, they 

 form a foot bridge, which aids the lock tender in his duties. The 

 gate is retained in its place by a collar around the coin post at the 

 top ; this is attached by keys to circular iron bars which are bolted 

 to the coping. 



During the time of a high flood in the Ohio river, five of these locks 

 will be covered with water, so that it will be r>ecessary to secure the 

 gates from floating. In order to do this, it is proposed to put a per- 

 manent band around the top of the coin post, with the under side lev- 

 el with the coping, as seen in Fig. 2, at a. In the middle of the pe- 

 riphery of the hollow coin, a groove is cut to receive an iron bar h, 

 four feet long ; the lower end of this bar is inserted in the wall ; at the 

 top is a head or projection, which covers the band and prevents the 

 gates from rising. 



