Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

297 OF ENGINEERING FORMULAE. B REAKW aters—cont inued, PLYMOUTH BBEAKWÄTEB—continued, • Outer slopes—1| to 1 from bottom to 7 ft. 6 in. below low-water line. 4 to 1 to low-water line. 16 „ 1 to 4 ft. 6 in. above iow- water line. 5 to 1 to high water. Inner slope—1| to 1 above low-water line. 2 „1 below „ „ Body of breakwater cased with large squared stones cramped together. PORTLAND. Depth of water, 58 feet, high. » ,, øl 5, lOW. Outer slopes—1 to 1 from bottom to 20 ft. below low water. 2 to 1 to 12 ft. below low water. 6 „ 1 to low-water line. 7 ,, 1 to high „ Inner slope—1| to 1. Body of breakwater, rubble, with crest wall of ashlar. DOVER. Depth of water, 61 feet, high-wafer line. „ 42 „ low „ Body of breakwater, concrete blocks faced with granite; batter 3 inches to the foot, stepped up in each course.