JETTIES. 9 



wharfage at the ends of the dock ; by a still greater reduction of 

 width, the available wharfage would be still further augmented. 



Some; of the objections to a width of dock greater than is 

 actually required for the proper manoeuvring of ships may be 

 noticed as follows : Loss of land area, which would be of the 

 greatest value in developing the full capabilities of the dock 

 property, cost of excavating and forming the unnecessary water 

 area. The excessive length of warps and hawsers required in 

 moving and turning vessels, the distance to which signals or 

 orders as to the working of the capstans, or the manipulation of 

 the hawsers and warps have to be transmitted. 



Jetties. The introduction of jetties projecting into the basin 

 affords a convenient and economical means of increasing the 



Wharfage t 

 8,390 feet T 



Water^Area. 

 3o'-8s"acres 



FIG. 5. 



wharfage accommodation; it is, however, of the utmost im- 

 portance to guard against the basin being unduly crowded 

 thereby, and thus hinder the free movements of ships. Referring 

 to Fig. 1, the introduction of jetties, as shown by dotted lines, 

 would add 2100 feet to the available wharfage, whilst still leaving 

 ample room for a ship to turn. In Figs. 2, 3, 4, jetties placed 

 as indicated by dotted lines would add 1433, 2200, and 2744'44 



