74 NOTES ON DOCKS AND DOCK CONSTRUCTION. 



left between each for oak wedges to be inserted, thus to dis- 

 tribute, as soon as they were finally bolted up, an equal pressure 

 throughout the whole. 



PLAN AT UPPER WALING 





FIG. 52. 



The ends of this dam abutted against the wall of the steam 

 basin, chases being cut into the masonry part of the way down 



Lri'el of Coping 



pieces 



for <trti.'i>! Piles, a nd then 



FIG. 53. 



for the piles, and recesses were also cut for the ends of the 

 walings. A regular system of diagonal bracing was provided at 

 the level of each waling, of which there were two tiers, respec- 



