DIEDRICH. The Theory of Strains, a Compendium for the calculation and construction of Bridges, Roofs, and Cranes, with the application of Trigonometrical Notes, containing the most comprehensive information in regard to the Resulting strains for a permanent Load, as also for a combined (Permanent and Rolling) Load In two sections, adadted to the requirements of the present time. By John Diedrich, 0. E. Illustrated by numerous plates and diagrams, 8vo, cloth.... 5 00 WILLIAMSON (R. S.) On the use of the Barometer on Surveys and Reconnoissances. Part I. Meteorology 15 oo POOK (S. M.) Method of Comparing the Lines and Draughting Vessels Propelled by Sail or Steam. 5 00 ALEXANDER (J. H.) Universal Dictionary of Weights and Measures, Ancient and Modern, re- 3 50 BROOKLYN WATER WORKS. Containing a De scriptive Account of the Construction of the Works, tions. I vol. folio, cloth. ards Steam Engine Indicator, with an Appendix by I $2 oo POPE. Modern Practice of the Electric Telegraph. 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Comprising the determination of Algebraic formulas for strains in Horizontal, Inclined or Rafter, Triangular, Bowstring, Lenticular and other Trusses, from fixed and moving loads, with practical applicatioi and examples, for the use of Students and Engineers. By Samuel H. Shreve, A. M., Civil Engineer. 87 wood cut illustrations. 8vo, cloth...... 5 00 MERRILL. Iron Truss Bridges for Railroads. The method of calculating strains in Trusses, with a careful comparison of the most prominent Trusses, in reference to economy in combination, etc., etc. Ву Brevet. Col. William E. Merrill, U. S. A., Major Corps of Engineers, with nine lithographed plates of Illustrations. 4to, cloth... 5 00 WHIPPLE. An Elementary and Practical Treatise on Bridge Building. An enlarged and improved edition of the author's original work. By S. Whipple, C. E. inventor of the Whipple Bridges, &c. *Illustrated 8vo, cloth... of the Regimen of the Missouri River, and a descrip- MAC CORD. 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