206 



HARBOUR CONSTRUCTION. 



OFFING 



FIG. 43. Alderney breakwater. 1 Cross-section of superstructure from the shore out to 410 feet. 



I 



-g^l ;! W.J" 1),^,- . I r> /__L. ( |:^^j^_JL-^L T ^rfj' 1 - 



FIG 45. Ditto. Cross-section from 2700 feet out to the head. 

 1 Min. Proc. Inst. C.E., vol. xxxvii. pi. iv. 



