Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 300
two lighthouses erected on theextremities of the breakwater being half a mile. The piers are made of concrete which was cast in blocks weighing10 tons each. This composition has of late years been greatly approvedby engineers where stone cannot be procured. The sea-face of the greatcanal in Holland… … Fig. 128.—Birds-eye View of Port Said. were used. They were not laid with the regularity of ordinary masonry,but had been dropped from large barges, so that they presented a veryrugged and uneven appearance (Fig. 129) ; but the object of throwing outthese great bulwarks is for the purpose of…
Inventions
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