The notes on which these essays are based were collected in the course of two commissions spent under the lee of the Admiralty library, close to the Royal United Service Institution, and in touch with the Reading Room of the British Museum and other public sources of information.

The lack of a book describing in popular language the materialistic side of naval history is, I think, generally admitted. Historians as a rule have devoted small space to consideration of material; in particular, the story of the revolutionary changes in naval material which took place during the nineteenth century has never been placed before the public in convenient form. In the attempt to supply such a description I have taken the liberty, as an engineer, of treating of naval material as a whole; tracing, as well as my technical knowledge permits, the progress of all the three principal elements—ship, gun, engine—and their interdependence. The result, faulty and incomplete as it is, may nevertheless be of considerable service, it is hoped, in clarifying the work of the historians and bridging the gap which divides the classic histories from our modern text-books.

I have considered our modern navy to begin with the “Admiral” class of battleship, about the year 1880.

My respectful thanks are due to the heads of three Admiralty departments: Captain R. H. Crooke, C.B., lately Director of Naval Ordnance; Engineer Vice-Admiral Sir George Goodwin, K.C.B., LL.D., Engineer-in-Chief of the Fleet; and Sir Eustace T. D’Eyncourt, K.C.B., Director of Naval Construction; for their unofficial approval. I wish to acknowledge my indebtedness to the officials of the Admiralty and the R.U.S.I. libraries,vi for their invariable kindness; to the Directors of the British and S. Kensington Museums, for permission to reproduce pictures in their possession; to Mr. A. W. Johns, C.B.E., Assistant Director of Naval Construction, Engineer Commander E. C. Smith, O.B.E., R.N., Mr. H. W. Dickinson, of the S. Kensington Museum, Mr. Edward Fraser, and Sir George Hadcock, F.R.S., R.A., of Elswick, for various help and criticism; and especially to Mr. L. G. Carr Laughton, of the Admiralty library, of whose advice and knowledge I have often availed myself, and to whose encouragement the completion of the work has been largely due.

It only remains to state that the whole of the book is written and published on my own responsibility, and that it is in no manner or degree an official publication.