The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

MARINE TRENT VALLEY CANAL HYDRAULIC LIFT LOCK. The Trent Valley canal is the name given to a water route across the Province of Ontario, to connect Georgian bay with Lake Ontario, a portion of which will be open for traffic the coming season. REVIEW 17 tion, are completed there will be a continuous line of naviga- tion from Heeley's Falls on the Trent to Lake Simcoe, about 160 miles. The Scugog branch has been in use for many years. The canal is in- Though called a canal the term is a misnomer, as in the whole distance of 200 miles there will not be more than fifteen or twenty miles of canal, the remain- der being through lakes «and. Tiver stretches, rendered navigable where necessary by dams and other improve- ments. Where canaling is requir- ed the prism will have a width of 50 ft. on the bot- tom, with side slopes of two to one in earth, and one-fourth to one ini rock, The general line ' CONCRETE CONSTRUCTION OF HYDRAULIC LIFT LOCK. of the canal was selected by the British government in 1835, and works were commenced in 1837 and carried so far as to make some portions available for local use. Locks have been built since at two points by the Ontario government and the work is now being car- ried out by the government of Canada. Commencing at Trenton, where the River Trent empties into the Bay of Quinte, an arm of Lake Ontario, the canal follows the Trent to Rice lake, thence up the Otonabee, through Clear, Stony, Lovesick, Deer, Buckhorn, Che-. tended for barges only. There will Dé 13 locks; t34. £4 in length by 33 ft. in width, with a depth of 6 ft. on the sills, though all the works are be- ing so constructed that a depth of 8 ft. can be obtained at very little extra expense. The ca- pacity of barges drawing 8 ft. will be 25,000 bu., three times that of the Erie canal barges. The locks will be of the ordinary type, with the ex- ception of three hydraulic lifts. The greatest, of which the accompanying illustrations will give an idea, is lo- cated in a section 4 miles, built to overcome the obstructions to navigation in the River Otonabee, where it passes the town of Peterboro. The total difference in elevation in this section is 77 ft., 65 ft. of which occurs in a distance of 800 ft. Here the hydraulic lock is suitable and the difference in height overcome in one lockage. This lock requires only a few finishing touches in the spring, when it will be ready for use. The lift lock is theoretically an automatic machine. There are two water tight steel boxes. or mong, Pigeon, Sturgeon, Came- ron and Balsam lakes, the latter be- ing. the summit, 150 miles from Trenton. From Balsam lake the valley of the Tal- bot, & small stream, will be foi- lowed. to Lake Simcoe, thence through Lake Cou- chiching and down the Severn river to Georgian bay. A branch from Stur- geon lake up the Scugog river and through Lake Scu- gog reaches Port Perry, 190 miles from Trenton, When the two cen- tral divisions, now under --_ construc- Peres ess ei Pe HYDRAULIC LIFT LOCK, TRENT VALLEY CANAL, SHOWING ROADWAY. chambers, 140 it. , long by 33 ft. wide, with 8 ft. of water in the clear, and closed at the ends by gates hung on the lower edge. The ends of the canal reaches 'are closed by similar gates. 'hese chambers are car- ried by means of heavy trusses on top of two rams, 7 ft. 6 in. in diame- ter, which work in two. steel water tight presses, one under each cham- ber. The presses are connected by a pipe I2 in. in di- ameter, in the cen- ter of which is placed a valve to control the passage