The form on the lower face commences on a curve, described by a radius of 55 feet, and continues to within about 10 feet of tho top, when a reversed curve, on a radius of 10 feet, carries the face over and meets the back line of the wall. The back line is carried up vertically, with occasional offsets. The main body of the work is laid up of rough stone ;

the curved face of large and closely cut stone, with four heavy courses at the bottom dovetailed together, the joints cut to the line of radius of curve.

Above the masonry an embankment of earth is filled in, and extends to 275 feet in width on the bottom, with a slope of one to five on the up-stream face. The north end of the new weir is germinated by an abutment that rises 12 feet above it. From the toe of the masonry an apron is extended 35 feet, composed of hewn timber secured by ties, bolts, and treenails, in a very substantial manner, and filled for 16 feet from the stone work, with concrete masonry, and the remainder with loose stone, and covered with a course of 6 inch white elm plank. A second apron is partly made which is to extend 30 feet further.

At 300 feet below the main dam, a second dam is in progress, which is to be 9 feet high, constructed of timber, stone and gravel, which will set the water back over the of the main and form a to check the water as it falls on it. apron dam, pool A coffer dam was constructed in the river to inclose about 120 feet of the work, from which the water was pumped by a steam engine, and a concrete foundation laid down on a very firm hard pan.