. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. I THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 210 end in tolal failure; and when to this I shall have added what I have yet lo say upon the subject of Cherbouri;, Plyrnoudi, and Delaware break- waters, works actually constructed ou the principles which the new theory would abandon, and shall have adduced the opinion of the most eminent and enlifjhteiied engineer of France, I trust I shall be considered to have made a good case in suppoit of this dissent. There is no part
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. I THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 210 end in tolal failure; and when to this I shall have added what I have yet lo say upon the subject of Cherbouri;, Plyrnoudi, and Delaware break- waters, works actually constructed ou the principles which the new theory would abandon, and shall have adduced the opinion of the most eminent and enlifjhteiied engineer of France, I trust I shall be considered to have made a good case in suppoit of this dissent. There is no part of the Report of the :;8th January I84C from which I more decideJly dissent than that which refers to Cherbourg Breakwater as a failure, and as " au attempt which may serve as a warning to those who may have to decide upon the construction of such works in this country," that they avoid eniirely the principles upon which that work has been cou- strncled. In the Annex (M.) is a brief historical account of Cherbourg Break- water from the commencement, together with an extract of the Report of tlie Co[nnii6sion of the Institute of France, of which Prony and Cliarles Dupiti Here members, and Girard rapporteur. These eminent men, after a careful inspection of that work, and after having investigated the whole process of its execution throughout, reported that the fadures which had taken place arose, not from its having a sloping face, but that the slopes were not long enough to resist the action of the waves; that no constant degree of slope is calculated lo resist the dill'ereut actions of the sea at dif- ferent depths; that these actions reduced gradually the masses of stone forming the origmal djke, to a protile having ddlereut degrees of slope, and that this necessarily diminished the height of the work at dilVerent times. 'I'hey ailded that the whole mass was thus, at lengih, brought into a slate of the most perfect stability ; and all this was verified by the United
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