Technical World Magazine HENRY M. HYDE, Editor R. T. MILLER, Jr., Publisher Leaders for July, 1913 The Pure Food Law-A License to Poison PAGE Charles Edward Russell 642 . A. C. Laut 651 George H. Cushing 660 Dr. Stephen Innes 678 C. H. Claudy 684 Robert G. Skerrett 695 F. C. Walsh, M. D. 703 Fifty Other Striking Features Technical World Magazine should be on the news-stands on the 17th of the month preceding the date of issue. Patrons unable to get the magazine on the 17th will confer a favor by notifying the Circulation Manager. News-stand patrons should instruct their News-dealer to reserve their copy of Technical World, otherwise they are likely to find the magazine "sold out." TERMS: $1.50 a year; 75 cents for six months; 15 cents a copy. Foreign postage, $1.00 additional; Canadian postage, 50 cents additional. Notice of change of address should be given thirty days in advance to avoid missing a number. TECHNICAL WORLD Home Office: 58th St. and Drexel Avenue, Chicago MAGAZINE Eastern Office: 1702 Flatiron Building, New York Copyright, 1913, by Technical World Magazine PATENTS PATENTS TRADEMARKS AND COPYRIGHTS SECURED OR FEE RETURNED Send model or sketch and description of your invention for free search of the U. S. Patent Office records. Our Four Books mailed Free to any address. Send for these books; the finest publications ever issued for free distribution. HOW TO OBTAIN A PATENT Our Illustrated eighty page Guide Book is an invaluable book of reference for inventors and contains 100 mechanical movements illustrated and described. FORTUNES IN PATENTS new ideas protected by OWEN PATENTS. Send for my free literature and read their wants. Three finest patent books published! 72-page guide FREE! Successful Patents;" "Stepping Stones" (contain ing list of over 200 inventions wanted; tells the plain truth Very highest references. I help my clients sell their pat- RICHARD B. OWEN, 19 Owen Bldg., Washington, D. C. C. L. PARKER Formerly Member Examining 44 MCGILL BLDG. WASHINGTON, D. C. Patents, Trade Marks, Copyrights, Patent Litigation Handbook for Inventors, "Protecting, Exploiting and Selling Inventions" sent free upon request. Sexology A Happy Marriage Depends largely on a knowledge of the whole truth about self and sex and their relation to life and health. This knowledge does not come intelligently of itself, nor correctly from ordinary everyday sources. SEXOLOGY Making Thrills for the Night Fans. Science to Free the Rubber Slaves What the Fire Inspectors Found Making an Immigrants' Paradise Learning to Fly on the Ground PAGE George H. Cushing 802 Edward Lyell Fox 814 Bailey Millard 819 Robert H. Moulton 832 Arthur St. George Joyce 878 Fifty Other Striking Features Technical World Magazine should be on the news-stands on the 17th of the month preceding the date of issue. Patrons unable to get the magazine on the 17th will confer a favor by notifying the Circulation Manager. News-stand patrons should instruct their News-dealer to reserve their copy of Technical World, otherwise they are likely to find the magazine "sold out." a TERMS: $1.50 year; 75 cents for six months: 15 cents a copy. Foreign postage. $1.00 additional; Canadian postage, 50 cents additional. Notice of change of address should be given thirty days in advance to avoid missing a number. TECHNICAL WORLD Home Office: 58th St. and Drexel Avenue, Chicago MAGAZINE Eastern Office: 1702 Flatiron Building, New York Copyright, 1913, by Technical World Magazine new ideas protected by OWEN PATENTS. Send for my free literature and read their wants. FREE! Three finest patent books published! 72-page guide "Successful Patents;" "Stepping Stones" (containing list of over 200 inventions wanted; tells the plain truth about prizes, reward offers, etc.) and "Patent Promotion (tells how to sell your rights; chief causes of failure, etc.) All sent free upon request. Very highest references. I help my clients sell their patents or dispose of their applications. Advice free. No obligation incurred by writing me. Free manufacturing facilities. I secure patent or no fee. No charge for report as to patentability, practicability, etc. RICHARD B. OWEN, 19 Owen Bldg., Washington, D. C. PATENTS C. L. PARKER Formerly Member Examining Corps, U. S. Patent Office PATENT LAWYER 44 MCGILL BLDG. WASHINGTON, D. C. THAT PROTECT AND PAY Books, Advice and Searches FREE Send sketch or model for search. Highest References. WATSON E. COLEMAN, Patent Lawyer 624 F. Street, N. W. PATENTS Washington, D. C. BRING WEALTH; proof, "Profit" which may be worth hun dreds of dollars to you, books and advice free. Low rates, easy terms. A. WEDDERBURN, Pat. Atty., Dept. 93, Washington, D. C. Sexology A Happy Marriagé Depends largely on a knowledge of the whole truth about self and sex and their relation to life and health. This knowledge does not come intelligently of itself, nor correctly from ordinary everyday sources. SEXOLOGY (Illustrated) by William H. Walling. A. M., M. D., imparts in a clear, wholesome way, in one volume: Knowledge a Young Man Should Have. Knowledge a Young Husband Should Have. Knowledge a Father Should Have. Knowledge a Father Should Impart to His Son. Medical Knowledge a Husband Should Have. Knowledge a Young Woman Should Have. Knowledge a Mother Should Have. Knowledge a Mother Should Impart to Her Daughter. Medical Knowledge a Wife Should Have. All in one volume. Illustrated, $2. postpaid. Write for "Other People's Opinions" and Table of Contents. PURITAN PUB. 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