2°4 DOCK ENGINEERING.
Lock, can be used at any state of the tide, having a depth of 16 feet ofwater
at low water of ordinary spring tides. The basin entrance and the passage
between the basin and No. 1 Dock are each 80 feet wide. The sills are
curved, with a versed sine of 3 feet, and a central draught of 407 feet at
high water ordinary springs, and 32-3 feet at high water ordinary neaps
Timber guiding jetties, 200 feet in length, are erected seaward of the basin
entrance, and a masonry jetty, with timber fenders, 600 feet long, leads to
the Lady Windsor Lock. This last bas a length of 647 feet, a depth of 60
feet and a width of 65 feet. It is divided into two compartments by an
intermediate pair of gates. The depth at the centre of the curved sills is
52-8 feet at high water of ordinary springs, and 44-4 feet at high water of
ordinary neaps.
Eglinton Dock Entrance, Ardrossan.*
The walls of the entrance (fig. 201) were founded on rock excavated 4A
feet below the sill, which is level with the bottom of the dock and tidal
basin; the gate floor is 18 inches lower than the sill. The sluices on
Fo^T-
.Gøi.o:
’ig. 201. Entrance to Eglinton Dock, Ardrossan.
each side ot the entrance are 3 feet wide and 4 feet high, with inlet sluices,
- feet wide and 2 feet high, at the bottom of the gate recess. The sili-
stones, hollow qtioins, and sluice chamber guides are of granite, the rest are
built in rubble concrete, except the sill, gate floor, and aprons, which are of
concrète.
»Robertson on “ Ardrossan Harbour Extensions,” Min. Proc. Inst. C.E., vol. cxx.