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146
HARBOUR ENGINEERING.
and the southerly 250 feet of it had settled some 2 feet. In the early part
of the year, in a storm of exceptional severity, the 600 feet of completed
superstructure was torn down to a height of about 5 feet above mean low
water.
Modifications in design, recommended by a board of inquiry and adopted
in September 1902, are shown in fig. 121.
Section adopted 1892.
Scale of Feet.
r~ r~i--i---i---i---i---1
10 5 0 10 to 30 40 50
Fig. 120. — Section of Breakwater, Sandy Bay, U.S.A.
The capstones in the new plan are to weigh not less than 20 tons, to be
20 feet long by 3 feet by 5 feet in end-section, laid on edge, and in as close
contact as possible. The course below the capstones is to contain two stones,
each weighing about 10 tons, the outer stone to be at least 15 feet long and
Section adopted J902.
Scale of Feet
m1111I
10 5 0 10 20 30 40 50
Fig. 121. — Section of Breakwater, Sandy Bay, U.S.A.
the inner one at least 10 feet. Below this course, to a depth of 12 feet below
mean low water, the stones in the outer face weigh at least 8 tons, and in
the inner face, at least 3 tons; and all are to be laid horizontal and as
headers.
Including what had been spent up to 1902, the total estimate of cost for
the work was $6,904,952. It is estimated that, when completed, the work will