« PreviousContinue »
GUARANTEED. PATENTS SECURED OR FEE RETURNED.
free distribution "HOW TO OBTAIN A PATENT." with 100 MECHANICAL MOVEMENTS Illustrated and described, and “WHAT TO INVENT," containing valuable LIST OF INVENTIONS WANTED. ONE MIL
S offered for one invention, $16,000 for other. Patents advertised free in VULLAN "WORLD'S PROGRESS." Copy free.
EVANS, WILKENS & CO., 615 F Street, WASHINGTON, D, C,
PATENT WHAT INVENT!
Mention Technical World Magazine
Are the Fastest and Safest Boats Built They are built of smooth, pressed steel plates, with air chambers in each end like a lifeboat. The smooth, steel hull has handsome lines, and glides through the water with the least possible resistance they are faster, more durable and safer-they don't crack, leak, dry out, or sink.and are elegantin design and finish.
The Mullins Steel Motor Boats have revolutionized motor boat building, and are superior in every way to wooden motor boats. They are equipped with Mullins Reversible Engines, so simple in construction, and so dependable that a boy can run them, and the Mullins Improved Underwater Exhaust, which makes them absolutely noiseless. Every boat is absolutely guaranteed.
See exhibit N. Y. Motor Boat Show, February 17-26.
Write for catalogue of Motor Boats-Row Boats -Hunting and Fishing Boats.
Cyclopedia of Engineering
Five volumes, 2,500 pages, fully indexed, size of page 7 x 10 inches, bound in three quarters red morocco leather. Over 2,000 full-page plates, diagrams, sections, tables, formulæ, etc. Written by the foremost authorities and especially prepared for Home Study, after a careful study of shop needs and conditions. Years of experience in shop, laboratory and class room required in its preparation. Each section tested by actual use for its practical value to the man who desires to know the latest and best practice in shop and engine room. Numerous explanatory examples. Complete sets of test questions and reviews in every volume, thus combining the best features of a text book and a reference work. It is easily understood by the man who has little time to acquire the fundamental principles of Engineering.
NOW $19.80-REGULAR PRICE $30
Just the set of books for the Engineer, Boiler-maker, Machinist, Tool-maker, Pattern-maker, Sheet Metal Worker,
Gas Engineer, and persons coming in contact directly or indirectly with machinery, The Cyclopedia is compiled largely from our instruction books, which have been tested by thousands of practical men. Each volume contains a series of test questions to emphasize vital points. Prepared especially for home study in a plain, understandable manner. This liberal offer is made for 30 days only to acquaint the readers of the TECH
PARTIAL LIST OF CONTENTS NICAL WORLD with the practical character of our correspondence instruction. Look them over for five days. If satisfac
Principles of Heat -- Chemistry - Boilers-Calorimeterstory, send us 82.00 down and $2.00 per month thereafter until the
Steam Pumps-Elevators. Steam Engines-Steam Engine Indi
cators-Valve Gears-Thermo-dynamics-The Steam Turbinespecial price of $19.80 is paid; otherwise, notify us and we will
Refrigeration-Ammonia Compression System and Absorption transfer the books absolutely free.
System-Gas and Oil Engines. Marine Boilers-Marine Engines
AMERICAN SCHOOL OF
CORRESPONDENCE 3322-28 Armour Avenue ... CHICAGO, ILL. |
Please Mention Technical World Magazine, Feb. '07
Mention Technical World Magazine