Brazing and Soldering. By JAMES F. HOBART. The only book that shows you just how to handle any job of brazing or soldering that comes along; it tells you what mixture to use, how to make a furnace if you need one. Full of valuable kinks. The fifth edition of this book has just been published, and to it much new matter and a large number of tested formulas for all kinds of solders and fluxes have been added. Price, 35c. Aviation Chart CHARTS Location of Airplane Power Plant Troubles Made Easy. By LIEUT. VICTOR W. PAGE, A.S., S.C.U.S.R. A large chart outlining all parts of a typical airplane power plant, showing the points where trouble is apt to oceur and suggesting remedies for the common defects. Intended especially for aviators and aviation mechanics on school and field duty. Price, 35 cents Modern Submarine Chart-With 200 Parts Numbered and Named. A cross-section view, showing clearly and distinctly all the interior of a submarine of the latest type. No details omittedeverything is accurate and to scale. This chart is really an encyclopedia of a submarine. Price, 25 cents Box Car Chart. A chart showing the anatomy of a box car, having every part of the car numbered and its proper name given in a reference list. Price, 25 cents Gondola Car Chart. A chart showing the anatomy of a gondola car, having every part of the car numbered and its proper reference name given in a reference list. Price, 25 cents Passenger Car Chart. A chart showing the anatomy of a passenger car; having every part of the car numbered and its proper name given in a reference list. Price, 25 cents Steel Hopper Bottom Coal Car. A chart showing the anatomy of a steel hopper bottom coal car, having every part of the car numbered and its proper name given in a reference list. Price, 25 cents Tractive Power Chart. A chart whereby you can find the tractive power or drawbar pull of any locomotive without making a figure. Shows what cylinders are equal, how driving wheels and steam pressure affect the power. What sized engine you need to exert a given drawbar pull or anything you desire in this line. Price, 50 cents Shows the horse-power of any stationary engine without calculation. No matter what the cylinder diameter of stroke, the steam pressure or cut-off, the revolutions, or whether condensing or non-condensing, it's all there. Easy to use, accurate and saves time and calculations. Especially useful to engineers and designers. Price, 50 cents Boiler Room Chart. By GEORGE L. FOWLER. A chart-size 14 x 28 inches-showing in isometric perspective the mechanisms belonging in a modern boiler room. This chart is really a dictionary of the boiler room-the names of more than 200 parts being given. Price, 25 cents COKE Coke-Modern Coking Practice, Including Analysis of Materials and Products. By J. E. CHRISTOPHER and T. H. BYROM. This, the standard work on the subject, has just been revised and is now issued in two volumes. It is a practical work for those engaged in Coke manufacture and the recovery of By-products. Fully illustrated with folding plates. It has been the aim of the authors, in preparing this book, to produce one which shall be of use and benefit to those who are associated with, or interested in, the modern developments_of the industry. Among the chapters contained in Volume I are: Introduction; Classification of Fuels; Impurities of Coals; Coal Washing; Sampling and Valuation of Coals, etc.; Chlorific Power of Fuels; History of Coke Manufacture; Developments in Coke Oven Design; Recent Types of Coke Ovens; Mechanical Appliances at Coke Ovens; Chemical and Physical Examination of Coke. Volume II covers By-products. Each volume is fully illustrated, with folding plates. Price, $3.00 per volume COMPRESSED AIR Compressed Air in all Its Applications. By GARDNER D. HISCOX. This is the most complete book on the subject of air that has ever been issued, and its thirty-five chapters include about every phase of the subject one can think of. It may be called an encyclopedia of compressed air. It is written by an expert, who, in its 665 pages, has dealt with the subject in a comprehensive manner, no phase of it being omitted. Over 500 illustrations. Fifth Edition, revised and enlarged. Cloth bound, $6.00. Half Morocco, revised and enlarged. Cloth bound. Price, $6.00 CONCRETE Concrete Wall Forms. By A. A. HOUGHTON. A new automatic wall clamp, is illustrated with working drawings. Other types of wall forms, clamps, separators, etc., are also illustrated and explained. Price, 75 cents By A. A. HOUGHTON. The molds for molding squares, hexagonal and many other styles of mosaic floor and sidewalk blocks are fully illustrated and explained. Price, 75 cents Practical Concrete Silo Construction. The By A. A. HOUGHTON. Complete working drawings and specifications are given for several styles of concrete silos, with illustrations of molds for monolithic and block silos. tables, data, and information presented in this book are of the utmost value in planning and constructing all forms of concrete silos. Price, 75 cents Molding Concrete Bath Tubs, Aquariums and Natatoriums. By A. A. HOUGHTON. Simple molds and instruction are given for molding different styles of concrete bath tubs, swimming pools, etc. Price, 75 cents Molding Concrete Chimneys, Slate and Roof Tiles. By A. A. HOUGHTON. The manufacture of all types of concrete slate and roof tile is fully treated. Valuable data on all forms of reinforced concrete roofs are contained within its pages. The construction of concrete chimneys by block and monolithic systems is fully illustrated and described. A number of ornamental designs of chimney construction with molds are shown in this valuable treatise. 75 cents Molding and Curing Ornamental Concrete. By A. A. HOUGHTON. The proper proportions of cement and aggregates for various finishes, also the methods of thoroughly mixing and placing in the molds, are fully treated. An exhaustive treatise on this subject that every concrete worker will find of daily use and value. Price, 75 cents Concrete Monuments, Mausoleums and Burial Vaults. By A. A. HOUGHTON. The molding of concrete monuments to imitate the most expensive cut stone is explained in this treatise, with working drawings of easily built molds. Cutting inscriptions and designs is also fully treated. Concrete Bridges, Culverts and Sewers. 75 cents By A. A. HOUGHTON. A number of ornamental concrete bridges with illustrations of molds are given. A collapsible center of core for bridges, culverts and sewers is fully illus trated with detailed instructions for building. Constructing Concrete Porches. 75 cents By A. A. HOUGHTON. A number of designs with working drawings of molds are fully explained so any one can easily construct different styles of ornamental concrete porches without the purchase of expensive molds. Price, 75 cents Molding Concrete Flower Pots, Boxes, Jardinieres, Etc. By A. A. HOUGHTON. The molds for producing many original designs of flower pots, urns, flower boxes, jardinieres, etc, are fully illustrated and explained, so the worker can easily construct and operate same. Price, 75 cents Molding Concrete Fountains and Lawn Orna ments. By A. A. HOUGHTON. The molding of a number of designs of lawn seats, curbing, hitching posts, pergolas, sun dials and other forms of ornamental concrete, for the ornamentation of lawns and gardens, is fully illustrated and described. 75c. Concrete on the Farm and in the Shop. By H. COLVIN CAMPBELL. This is a new book from cover to cover, illustrating and describing in plain, simple language many of the numerous appliances of concrete within the range of the home worker. Among the subjects treated are: Principles of reinforcing; methods of protecting concrete so as to insure proper hardening; home-made mixers; mixing by hand and machine; form construction, described and illustrated by drawings and photographs; construction of concrete walls and fences; concrete fence posts; concrete gate posts; corner posts; clothes line posts; grape arbor posts; tanks; troughs; cisterns: hog wallows; feeding floors and barnyard pavements; foundations; well curbs and platforms; indoor floors; sidewalks; steps; concrete hotbeds and cold frames; concrete slab roofs; walls for buildings; repairing leaks in tanks and cisterns; and all topics associated with these subjects as bearing upon securing the best results from concrete are dwelt upon at sufficient length in plain every-day English so that the inexperienced person desiring to undertake a piece of concrete construction can, by following the directions set forth in this book, secure 100 per cent success every time. A number of convenient and practical tables for estimating quantities, and some practical examples, are also given. 150 pages, 51 illustrations. Price, $1.00 Concrete From Sand Molds. By A. A. HOUGHTON. A practical work treating on a process which has heretofore been held as a trade secret by the few who possessed it, and which will successfully mold every and any class of ornamental concrete work. The process of molding concrete with sand molds is of the utmost practical value, possessing the manifold advantages of a low cost of molds, the ease and rapidity of operation, perfect details to all ornamental designs, density and increased strength of the concrete, perfect curing of the work without attention and the easy removal of the molds regardless of any undercutting the design may have. 192 pages. Fully illustrated. Cloth. Price, $2.00 Ornamental Concrete Without Molds. By A. A. HOUGHTON. The process for making ornamental concrete without molds has long been held as a secret, and now, for the first time, this process is given to the public. The book reveals the secret and is the only book published or which explains a simple, practical method whereby the con crete worker is enabled, by employing wood and metal tem plates of different designs, to mold or model in concrete any cornice, archivolt, column, pedestal, base cap, urn pier in a monolithic form-right upon the job. These may be molded in units or blocks, and then built up to suit the specifications demanded. This work is fully illustrated, with detailed engravings. Cloth. Price, $2.00 Popular Handbook for Cement and Concrete Users. By MYRON H. LEWIS. Everything of value to the concrete user is contained, including kinds of cement employed in construction, concrete architecture, inspection and testing, waterproofing, coloring and painting, rules tables, working and cost data. The book comprises thirty-three chapters. A valuable addition to the library of every cement and concrete user. Cloth, 430 pages, 126 illustrations. Price, $3.00 Waterproofing Concrete. By MYRON H. LEWIS. Modern methods of waterproofing concrete and other structures. A condensed statement of the principles, rules and precautions to be observed in waterproofing and damp-proofing structures and structural materials. Paper binding. Illustrated. Second Edition. 75 cents DIES METAL WORK Dies; Their Construction and Use for the Modern Working of Sheet Metals. By J. V. WOODWORTH. A new book by a practical man, for those who wish to know the latest practice in the working of sheet metals. It shows how dies are designed, made and used, and those who are engaged in this line of work can secure many valuable suggestions. Sixth revised edition. 525 illustrations, 394 pages. Cloth. Price, $3.50 Punches, Dies and Tools for Manufacturing in Presses. By J. V. WOODWORTH. An encyclopedia of die-making, punch-making, die-sinking, sheet-metal working, and making of special tools, subpresses, devices and mechanical combinations for punching, cutting, bending, forming, piercing, drawing, compressing, and assembling sheet-metal parts and also articles of other materials in machine tools. This is a distinct work from the author's book entitled "Dies; Their Construction and Use." 500 pages, 700 engravings. Second edition. Cloth. Price, $4.50 Drop Forging, Die-Sinking and Machine-Forming of Steel. By J. V. WOODWORTH. The processes of die-sinking and force-making, which are thoroughly described and illustrated in this admirable work, are rarely to be found explained in such a clear and concise manner as is here set forth. The process of die-sinking 1elates to the engraving or sinking |