210 NOTES ON DOCKS AND DOCK CONSTRUCTION. 



of the dock, consisting of a causeway formed of nidged granite 

 blocks 6 inches thick, set in and grouted with neat Portland 

 cement. 



The floor of the dock is level longitudinally, with a fall 

 transversely either way, for drainage to the side gutters. 



The exigencies of the site necessitated the driving along 



SECTION ON LINE A B IN FIG. 196. 



FIG. 197. 



both sides and round the head a row of close, tongued-and- 

 grooved sheet-piling (Figs. 199, 200) of pitch-pine timber, 

 28 feet long by 9 inches thick at the sides, and 12 inches round 

 the head. They were driven 16 feet into the undisturbed 

 bottom in four pile-bays. 



At the back of this sheet-piling, the ground was taken out 



''M nan O OQ CO O 





O O 



Alain Street 



SCALE 



IOO 20O 



FIG. 198. 



for a width of 7 feet 6 inches, and to a depth of G feet, and the 

 space filled up with concrete to the top of the piles (Figs. 199, 

 200). In front of the piles, the brickwork was brought up 

 from the invert, and carried over the tops of the piles, and over 

 the concrete at the back, forming a bed or platform on which 



