Plan of the Locks at Cincinnati, Ohio. 71 



admitting keel boats, coal arks, sections of lumber rafts, &c. to pass 

 to the upper part of the city, the locks are increased in width to eight- 

 een feet. The stones for the face of the walls, are obtained one hun- 

 dred miles up the Ohio river, at a place which the proprietor has na- 

 med Rockville ; and brought down on scows by the aid of a steam 

 boat. The whole work is taken by contract by Mr. John Lough- 

 ky; and it is under the direction and superintendance of Mr. Samu- 

 el FoRRER, whose reputation as an Engineer is no unenviable dis- 

 tinction. 



In the drawing are represented, the ground plan, and an elevation, 

 of one of those locks, by a scale of twelve feet to an inch. 



The foundation is composed of timber one foot thick, and laid 

 transversely, from four to six inches asunder ; the interstices are fil- 

 led with puddle of clay and gravel slightly wetted and compressed 

 with wooden rammers. Sheet piling are placed at each gate entire- 

 ly across the foundation, four feet deep, consisting of two inch plank, 

 jointed, and placed on end, resting against a stick of timber in the 

 bottom, and against one of the dogs at the top. On these timbers is 

 laid a floor of three inch plank, which is jointed except under the 

 walls. Both mitre sills are placed on this floor. The lower one is 

 nine inches high ; the top of which coincides with the bottom of the 

 canal ; the upper one is made eighteen inches high, so that the gates 

 will be less liable to obstruction from gravel. They are made at an 

 angle of twenty eight degrees ; and fastened down near the vertex 

 with bolts. Over the three inch floor, within the walls, a lining of 

 two inch plank is laid, and the whole secured to the timbers with ten 

 inch spikes. 



The face stone of the masonry is laid in mortar, and the rubble 

 wall is grouted. It is required by the contract that there shall be a 

 header in every ten feet in length ; the stones are obtained of such 

 size, that it is very seldom, that there is not a header at each end 

 of every stretcher. The edges of the face stones are rusticated or 

 chamfered, which gives to the -walls a bold and beautiful appear- 

 ance. Particular attention is paid, in placing the headers at the hol- 

 low coins, so that each stone which has a hollow coin cut in it, shall 

 have a header resting upon it. This is effected by placing them 

 alternately, in each course, above and below the hollow coin. The 

 walls are covered with coping three feet wide, and not less than one 

 foot in thickness ; at the head of the lock the coping is two feet 

 thick. 



