plain rules for laying off turnouts with tape-measure and pins 137 139 elevation of outer rail 142 instructions how to put in missing stakes on curves with tape PAGE III. Azimuths of North Star, and their natural tangents 150 IV. Roods and perches in decimal parts of an acre 151 V. Decimals of an acre in one chain length of 100 feet, and of X. Radii and their logarithms, middle ordinates, and deflection distances 155 XI. Squares, cubes, roots, and reciprocals of numbers, from 1 to 1,042. 161 XII. Logarithms of numbers from 1 to 10,000 179 XIII. Logarithmic sines, cosines, tangents, and cotangents 197 XIV. Natural sines and cosines 243 Natural tangents and cotangents 256 XVI. Chords, versed sines, external secants, and tangents of a 1° VALUABLE SCIENTIFIC BOOKS, PUBLISHED BY D. VAN NOSTRAND, 23 MURRAY STREET, AND 27 WARREN STREET, NEW YORK. WIESBACH (JULIUS). A Manual of Theoretical Mechanics. Translated from the fourth augmented and improved German edition, with an Introduction to the Calculus, by ECKLEY B. COXE, A.M., Mining Engineer. 1,100 pages and 902 woodcut illustrations. 8vo, cloth FRANCIS (J. B.). Lowell Hydraulic Experiments. Being a selection from Experiments on Hydraulic Motors, on the Flow of Water over Weirs, in Open Canals of Uniform Rectangular Section, and through submerged Orifices and diverging Tubes. Second edition, revised and enlarged, with twenty-three copperplate engravings. 4to, cloth ROEBLING (J. A.). $10 00 . 15 00 Long and Short Span Railway-Bridges. By JOHN A. ROEBLING, 25 00 CLARKE (T. C.). Description of the Iron Railway Bridge over the Mississippi River at Quincy, Ill. Twenty-one lithographed plans. 4to, cloth TUNNER (P.). A Treatise on Roll-Turning for the Manufacture of Iron. By PETER TUNNER. Translated and adapted by JOHN B. PEARSE, of the Pennsylvania Steel Works. With numerous engravings, woodcuts, and folio atlas of plates GILLMORE (Gen. Q. A.). 750 10 00 Practical Treatise on the Construction of Roads, Streets, and THE KANSAS-CITY BRIDGE. With an account of the Regimen of the Missouri River, and a description of the methods used for founding in that river. By O. CHANUTE, Chief Engineer, and GEORge Morrison, Assistant Engineer. Illustrated with five lithographic views and twelve plates of plans. 4to, cloth LEDOUX (M.). Ice-making Machines. The theory of the action of the various forms of cold-producing, or so-called Ice-Machines (Machines à Froid). 18mo, boards. Illustrated WATTS (ALEX.). Electro-Metallurgy Practically Considered. New revised and enlarged edition. [This new edition of this standard work, which has been in the market many years, and is well known by its intrinsic merits, has been very much increased in size, and has been added to in many of its departments, bringing it up to the latest developments of the art.] 12mo, cloth MCCULLOCH (R. S.). Elementary Treatise on the Mechanical Theory of Heat, and its AXON (W. E. A.). The Mechanics' Friend; a Collection of Receipts and Practical SHREVE (S. H.). A Treatise on the Strength of Bridges and Roofs. Comprising MERRILL (W. E.). Eighty Iron Truss Bridges for Railroads. The method of calculating strains in trusses, with a careful comparison of the most promi. nent trusses, in reference to economy in combination, &c. Illus. $6.00 50 1.00 3.50 150 5.00 |