138 NOTES ON DOCKS AND DOCK CONSTRUCTION. 



Figs. 109 to 112 show the concrete blocks used in the 

 foundations, and Figs. 113 to 116 the various sections adopted 

 for the quay walls. 



Princes Dock, Bombay. 1 The standard height of the walls of 

 this dock was 37 feet, but there were places where it was 



FIG. 103. 



FIG. 111. 



i jo 6O 



FIG. 110. 



FIG. 112. 



necessary to go 5 to 6 feet deeper in order to reach a firm 

 foundation. 



The strata consisted of surface silt and black mud overlying, 

 to a depth of 4 to 5 feet, a bed of dense blue clay of varying 



${0.02 (-.go) 

 - 





Fio. 114. 



'6-00) 



thickness, but nearly level on top; under this bed there was 

 found loam and disintegrated trap down to the solid trap rock. 

 The trenches were from 25 to 30 feet deep by 15 feet wide, 



1 Engineering, vol. xlviii. p. 101. 



