210 



RENNIE'S DOCKS AND HARBOURS. 



PART Yll. 



pier-head from entering the harbour, and to throw it 

 upon the opposite shore. The roadway was 50 feet 

 wide, and 8 feet above the level of high water of spring 

 tides, the parapet being 7 feet higher. The outer or sea 

 side of the pier was formed by a flat paved slope of 

 rough stone, laid at an inclination of 5 to 1. The quay- 

 wall was curved on the face one-fifth of the height ; the 

 thickness of the masonry being 10 feet upon the aver- 

 age, strengthened at the back by strong counterfoots, 



at the regular distance of 15 feet apart. The founda- 

 tion of this wall was laid below low water by means of 

 long stones, inclined to each other, in the same manner 

 as at Howth Harbour, where the plan had been found 

 to answer remarkably well. The centre of the pier 

 was composed of loose rubble, taken from the adjacent 

 shore, packed solidly ; the outside being paved with 

 large angular blocks varying from one to ten tons in 

 weight, well wedged together. The inside of the parapet 

 was built of solid masonry. The pier-head and jetty 



