'Cyclopedia A new enlarged edition, constituting a complete en- The set is published in two handsome volumes, bound in 1⁄2 red for examination No more comprehensive treatise on drawing has ever been pub- R. FRITSCH, New Orleans, La., says: "I cannot say half enough in praise SPECIAL OFFER To Readers of The Technical World Not Good After September 30th BOTH VOLUMES sent free on approval (express prepaid). Keep them five days. If satis- LIST OF AUTHORS AND SUBJECTS Freehand Drawing PROF. W. H. JAMES, Mass. Inst. of Technology Tinsmithing Practical Problems in Menguration American School of Correspondence CUT OFF HERE Please send me free, on approval (express prepaid,) one St. and No.. City.. State.............. ...... Mention The Technical World. LITERATURE-(Concluded) having perfectly solid heads in which the pin is firmly secured without penetrating the head. This method of construction is said to eliminate danger of injury to the thumb, and prolongs the usefulness of the tack. These are made in a large assortment of sizes, of various styles and prices, which are listed in the catalogue. The company also furnishes a variety of display cases in which the different thumb-tacks are attractively exhibited. Among the other novelties listed are numbered thumb-tacks containing raised figures which can be painted over without obliterating the number. EMPLOYMENT DEPARTMENT TO EMPLOYERS-THE TECHNICAL WORLD MAGAZINE offers its services in bringing employers of skilled labor into communication with trained and efficient men. Write the Employment Department full particulars as to the qualifications necessary. MAGNIFICENT WATER POWER FOR SALE which will develop ten thousand horse-power With this is included 200 acres at dam site and 300 acres at power site. The property should be developed in connection with the generation of electricity for power, as we have application from numerous industries for site when developments are assured. 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Mention The Technical World. The whole face of every day life is being changed by the introduction of electricity. Here is the story of electricity in all its various uses, told in non-technical language. We know of no book or set of books that treats the subject with such absorbing interest for the general reader. 66 Electricity in Every-Day Life” Vol. I. THE GENERATION OF ELECTRICITY AND MAGNETISM; 584 pages, 217 illustrations, of which 19 are full pages (3 in full color). Vol. II. THE ELECTRIC ARTS AND SCIENCES; 566 pages, 313 illustrations, of which 19 are full pages (3 in full color). Vol. III. THE ELECTRICAL ARTS AND SCIENCES (continued); 609 pages, 270 illustrations, of which 18 are full pages (2 in full color). This is undoubtedly the most comprehensive and extensive popular treatise on electrical subjects. It is written by the foremost electrical expert of the United States, Prof. Edwin J. Houston, a founder of the famous Thomas-Houston Electric Company, now known as the General Electric Company, whose arc and incandescent lights and trolley-car system are now used practically all over the world. It is no longer a matter of choice whether or not one shall become acquainted with the general facts and principles of electrical science. So intimately does electricity enter into our every-day life, that to know nothing of its peculiar properties or application is, to say the least, to be severely handicapped in the struggle for existence. The three volumes will be sent by express, prepaid, on receipt of $4.00 in stamps, draft, money order, or registered letter. A special easy payment offer will be submitted upon request. A prospectus will be sent upon request. 404 West 13th St., New York City P. F. 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