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CATALOGUE OF GOOD, PRACTICAL BOOKS It shows just what has been done, how it has been done, when it was done, and who did it. It saves time in hunting up patent records and re-inventing old' ideas. 88 Pages.........................................................$1.00 DRAFTING OF CAMS. By Louis Rouillion. The laying out of cams is a serious problem unless you know how to go at it right. This puts you on the right road for practically any kind of cam you are likely to run up against. 3d Edition......................................25 cents HYDRAULICS HYDRAULIC ENGINEERING. By Gardner D. Hiscox. A treatise on the properties, power, and resources of water for all purposes. Including the measurement of streams, the flow of water in pipes or conduits; the horse-power of falling water, turbine and impact water-wheels, wave motors, centrifugal, recipro- cating and air-lift pumps. With 300 figures and diagrams and 3G practical tables. All who are interested in water-works development will find this book a useful one, because it is an entirely practical treatise upon a subject of present importance, and cannot fail in having a far-reaching influence, and for this reason should have a place in the working library of every engineer. Among the subjects treated are: Historical Hydraulics, Properties of Water, Measurement of the Flow of Streams; Flow from Sub-surface Orifices and Nozzles; Flow of Water in Pipes; Siphons of Various Kinds; Dams and Great Storage Reservoirs; City and Town Water Supply; Wells and Their Reinforcement; Air Lift Methods of liaising Water; Artesian Wells; Irrigation of Arid Districts; Water Power; Water Wheels; Pumps and Pumping Machinery; Reciprocating Pumps; Hydraulic Power Transmission; Hydraulic Mining; Canals; Ditches; Conduits and Pipe Lines; Marine Hydraulics; Tidal and Sea Wave Power, etc. 320 pages. Price......... $4.00 INVENTIONS—PATENTS INVENTORS’ MANUAL, HOW TO MAKE A PATENT PAY. This is a book designed as a guide to inventors in perfecting their inventions, taking out their patents and disposing of them. It is not iniany sense a Patent Solicitor’s Circular nor a Patent Broker’s Advertisement. No advertisements of any description appear in the work. It is a book containing a quarter of a century’s experience of a successful inventor, together with notes based upon the experience of many other inventors. Among the subjects treated in this work are: How to Invent. How to Secure a Good Patent. Value of Good Invention. How to Exhibit an Invention. How to Interest Capital. How to Estimate the Value of a Patent. Value of Design Patents. Value of Foreign Patents. Value of Small Inventions. Advice on Selling Patents. Advice on the Formation of Stock Companies. Advice on the Formation of Limited Liability Companies. Advice on Disposing of Old Patents. Advice as to Patent? Attorneys. Advice as to Selling Agents. Forms of Assignments. License and Con- tracts. State Laws Concerning Patent Rights. 1900 Census of the United States by Counts of Over 10,000 Populate on. Revised edition. 120 pages. Price. . $1.00 KNOTS KNOTS, SPLICES AND ROPE WORK. By A. Hyatt Verrill. This is a practical book giving complete and simple directions for making all the most useful and ornamental knots in common use, with chapters on Splicing, Pointing, Seizing, Serving, etc. This book is fully illustrated with one hundred and fifty original engravings, which show how each knot, tie or splice is formed, and its appear- ance when finished. The book will be found of the greatest value to Campers, Yachts- men, Travelers, Boy Scouts, in fact, to anyone having occasion to use or handle rope or knots for any purpose. The book is thoroughly reliable and practical, and is not only a guide, but a teacher. It is the standard work on the subject. Among the contents are: 1. Cordage, Kinds of Rope. Construction of Rope, Parts of Rope Cable and Bolt Rope. Strength of Rope, Weight of Rope. 2. Simple Knots and. Bends. Terms Used in Handling Rope. Seizing Rope. 3. Ties and Hitches. 4. . Noose, Loops and Mooring Knots. 5. Shortenings, Grommets and Salvages. 6. Lashings, Seizings and Splices. 7. Fancy Knots and. Rope Work. 128 pages. 150 original engravings. Price..................................60 cents 19