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Meee TicAl SHIPBUILDING: A. Treatise on the Structural Design and Building of Modem Steel Ves- sels. The Work of Construction, from the Making of the Raw Matenal to the Equipped Vessel, including Subsequent Upkeep and Repairs. By A. CAMPBELL HOLMS, Member of the Institution of Naval Architects and of the Institution of Engineers and Shipbuilders in Scotland; Surveyor to Lloyd's Register of Shipping. 2 vols. (Vol. I, Text. Medium 8yo. Vol. II.. Diagrams and Illustrations. Oblong 4to.) The plan of the book is briefly as follows: First, attention is given to the fundamen- tal matters which govern the structural design; the various stresses to which the hull is exposed, their straining tendency, and the different structural designs by which the necessary strength to resist them may be secured. Secondly, each important part of the hull is considered by itself, and each one from three points of view. viz., its purpose in the structure and the particular stresses and straining effects to which it is liable; the various formations adopted in its design, with the rules governing them as regards scantlings and strength; and a description of the actual work of making itin a shipyard and fitting it to the ship. As a description of the actual work of the shipyard is reading of a-special character, it is dealt with separately in the second part of the book, the sequence generally being thus better preserved. $16.00, Po Re SOA Cr AAR A, PENTON PUBLISHING COMPANY Q 33 " WADE BUILDING, CLEVELAND. EE ee CONTRAST The wide and clear channel provided for navigation by this Scherzer Roll- ing Lift Bridge with the two narrow and inadequate chan- nels allowed by the obstructing center- pier swing bridge further up the river. Scherzer Rolling Lift Bridges can be opened or closed in less than 30 seconds, and in opening roll back and away from the navigable channel, giving greater free- dom for the move- ment of vessels through the draw than any other type of movable bridge. They can be de- signed to span any desired width of channel! and to meet the most com- plex local condi- The Scherzer Rolling Lift Bridge Co., Main Offices: 1616 Monadnock Block, ~ " Chicago, U. S. A. eeeeeeeeeeee eee rere eee TAS |