The value of Prof. Langley's contributions to aerodynamics and the influence which his own experiments in solving the problem of ar tificial flight have had upon the investigators cannot be over-appreciated. In the handsome volume which lies before us Prof. Langley has presented with a clearness conciseness and above all with a modesty that is characteristic of him the results of the very elaborate in vestigation which he carried out. We regret that the very limited amount of space at our disposal prevents us from devoting to the work a review commensurate with its importance. This is one of the handiest guides that has ever come to our notice. It gives just the kind of information that the amateur yachtsman wants. We are sorry to see how ever that its pages are liberally interspersed with advertising matter that might well have It Is SELF-CLEANING Wire Cloth Wire Lath Electrically-Welded Wire Fabrics Perforated Metal CLINTON WIRE CLOTH COMPANY CLINTON MASS. BOSTON NEW YORE CHICAG SAN FRANCISC THE BICYCLE: ITS INFLUENCE IN COLD GALVANIZING Automobile Jacks WALLACE SUPPLY COMPANY. cHICAR ILLINOIS. ELECTRO MOTOR. SIMPLE HOW T TheA Densmore Touch Pleases. DENSMORE TYPEWRITER CO. 309 Broadway NewYork BABBITT METALS.-SIX IMPORTANT _. - -7141 CTUREPTIMDC) Gas Engine IGNITER Carlisle & Finch Co. 233 E. Clifton Av. Cincinnati 0. Note the Graceful Lines BUFFALO STANHOPE BUFFALO ELECTRIC CARRIAGE CO B'JFFAL N. Y. 'Auto=Sparker Motsinger Device Mfg. Co. vii ramm vi 15 CENTS GETS THIS $650.00 AUTOMOBILE 'THE BOOK-KEEPER' CORK TIPS OR PLAIN MADE $ 105 THE FIRST MONTH 'The Sharer' 145A Mulberry St. New York. Remington I TYPEWRITER. The Experience of a Quarter of a Century is BEHIND IT The Confidence of the Business World is WITH IT An ever=widening field of usefulness is BEFORE IT WYCKOFF SEAMANS 4 BENEDICT 327 Broadway New York DRIVING LAMP. E. DIETZ CO 60 Laight Street. New York. '%.%.'%j-ESTABLISHED 1840..1‘. 50 YEARS' EXPERIENCE PATENTS TRADE MARKS DESIGNS COPYRIGHTS &C. BE
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