198 NOTES ON DOCKS AND DOCK CONSTRUCTION. 



Length at coping level 



on floor 



Width at coping level 



on floor 



Width of entrance at coping 



at springing of invert 

 Depth of water over invert ... 



fiora coping at entrance 



head ... 



Ft. in. 



468 



l-s o 



101 



42 6 



83 



80 



33 G 



39 



38 6 



FIG. 184. 



TW ' / x 



SCALE 



10 20 30 40 50 GO 



70 8O FLtT 



The following method was adopted for getting in the 

 masonry : The centre courses of botli the sub and upper floor 

 were set by a traveller, working at a low level on the centre 



