filled up with masonry of a heavy and solid nature, the work being continued up to the lip of the sluices, from which the apron had a steady and suit- able gradient to carry away the water to a point about 200 feet downstream, where the masonry joined the natural rock level. For the most part, the… … the construction of a heavy talus or apron in masonry, extending from the foot of the dam to a point some The whole of this masonry was then faced with squared, fine-grained, granite blocks. These blocks were 1534 inches deep, with heading courses in four sets, 314% inches deep, and they were all…
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