FLYING THE MODELS.

A suitable winder of some sort is essential for winding up the strands of a model aeroplane.

A winder is most easily made from an egg beater of the dover pattern. The egg beater is dismantled and fitted up in the manner shown in the illustration. The blades are fitted with hooks which engage those on the end of the rubber skein.

Plate XI. Winding a model.

In order to wind a model remove the skeins from the anchor hooks and hook them on the winder. Have some one hold the machine at the rear end, slipping the fingers around the propellers to keep them from untwisting. Stretch the skeins out to about twice their normal length and commence to wind. Gradually shorten the skein as the winding progresses until, at the time it is finished, it is down to its normal length.

FIG. 56. A winder made from an egg beater.

In winding the machine be careful to do it in such a manner that the machine is not wrenched or twisted. Always count the number of turns given the winder so that there will be no danger of twisting them up too tightly and causing them to break.

The successful flying of a model aeroplane is an acquired knack just like swimming or bicycle riding. It is usually necessary to make several attempts before the model can be made to fly well. As soon as one gets acquainted with the vagaries of a model aeroplane it is a very easy matter to launch and adjust a machine.

The large page in the front of the book shows the right way of launching a model. The fingers are passed over the propellers and the frame grasped firmly, but gently. The tip of the machine should be raised and pointed slightly upward. Then give it a gentle slow push forward and release it. Always launch a machine into the wind, that is against it. The machine will fly forward, rise rapidly, turn completely around and race down the wind for a thousand feet or more in the case of some of the larger machines described in this book when properly adjusted.

All the models described in this book with the exception of the first three must be flown out of doors because, when properly handled, they will travel upwards of one thousand feet.

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A NEW BOOK by the author of "Wireless Telegraph

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This is undoubtedly one of the most complete and comprehensive treatises on the subject ever published, and a close study of its pages will enable one to master all the details of the wireless transmission of messages. The author has filled a long-felt want and has succeeded in furnishing a lucid, comprehensible explanation in simple language of the theory and practice of wireless telegraphy and telephony.

The book treats the subject from an entirely new standpoint. Several very novel and original ideas have been carried out in its making. It is well illustrated by over one hundred and fifty interesting photographs and drawings. All diagrams have been made in perspective showing the instruments as they actually appear in practice. The drawings are carefully keyed and labeled. Many of the photographs are accompanied by phantom drawings which reveal the name and purpose of each part.

It is a book which the wireless experimenter cannot afford to be without. It will prove even more valuable to the layman.

Among the contents are: Introductory. Wireless Transmission and reception. The ether. Electrical Oscillations. Electro-magnetic waves. The means for radiating and intercepting electric waves. Aerial Systems. Earth Connection. The Transmitting Apparatus. Current Supply. Spark Coils and Transformers. Condensers. Helixes. Spark Gaps. Anchor Gaps. Aerial Switches, Etc. The Receiving Apparatus. Detectors, etc. Tuning Coils and Loose Couplers. Variable Condensers. Tuning and Coupling. Directive Wave Telegraphy. The Dignity of Wireless. Its applications and service. Wireless in the army and navy. Wireless on an aeroplane. How a message is sent and received. The Wireless Telephone. The Ear. How we hear. Sound and Sound Waves. The Vocal Cords. The Structure of Speech. The Telephone Transmitter and Receiver. The Photophone. The Thermophone. The Selenium.

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Build Your Own Wireless Instruments

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CONSTRUCTION FOR AMATEURS

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3d EDITION

220 Pages 163 Illustrations

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Thoroughly up to date and unusually complete. Gives in minute detail, full directions for constructing wireless apparatus and various outfits capable of receiving from 100 to 1,500 miles and transmitting 3 to 100 miles. Also clearly explains the purpose and action of each instrument. Directions for Operating and Adjusting, etc.

A SPLENDID TREATISE OF WIRELESS ALONG

CONSTRUCTIVE LINES

Price, $1.50, Postpaid

CONTENTS OF CHAPTERS

I.—Introduction. II.—The Apparatus. III.—Aerials and Earth Connections. IV.—Induction Coils. V.—Interrupters. VI.—Transformers. VII.—Oscillation Condensers and Leyden Jars. VIII.—Spark Gaps or Oscillators. IX.—Transmitting Helixes. X.—Keys. XI.—Aerial Switches and Anchor Gaps. XII.—Hot Wire Ammeter. XIII.—Oscillation Detectors. XIV.—Tuning Coils and Tuning Transformers. XV.—Receiving Condensers. XVI.—Telephone Receivers and Headbands. XVII.—Operation. XVIII.—The Amateur and the Wireless Law. How to Secure a License. Oscillation Helix. Quenched Spark Gap. Rotary Gaps. Kick-Back. The Variometer. New Crystal Detectors. The Audion.—Appendix.

ENDORSED BY WIRELESS CLUBS THROUGHOUT THE COUNTRY AS BEING

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The value of this book has been greatly increased by the addition of much new subject matter and many illustrations of recent interest.

The new text explains fully how to build the most recent forms of Quenched Gaps, Rotary Gaps, Dough-Nut Tuners, Kick-back Preventers, Audion Detectors and numerous other instruments, accompanied by dimensioned working drawings. Several very interesting and instructive photographs have been included.

If you are interested in Wireless you need this book.

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If you want to be an expert and an authority you must surround yourself with all available aids and helps. You have one of the best in the AMATEUR’S WIRELESS HANDY BOOK.

It contains 36 pages of wireless calls, 1500 in all. The list is complete and thoroughly revised to date and embodies all the wireless land stations in the world, the ships of the Merchant Marine, the U. S. Navy, the Revenue Service, etc. They are all there. All the calls are classified alphabetically. The list is the most reliable and complete in existence. All obsolete stations have been abolished. All corrections and changes have been made from the official lists.

BUT, THAT IS NOT ALL.

Pages with spaces to fill in names, call letters, etc., make it possible to keep an accurate record of nearby amateur stations.

THE CODES, BOTH MORSE AND CONTINENTAL, are shown in the form of two large full-page charts printed in heavy black type so that they can be read from a distance.

A BEGINNER’S SPEED CHART of both Codes so arranged that the codes may be quickly learned or consulted is provided.

All the Abbreviations used so constantly by the wireless operator to save time and labor are included. There are a couple of pages of them.

And last but not least

And last but not least Over 100 large hook-ups of wiring diagrams fully illustrated in a concise and clear manner. Loop and straightaway aerials, grounds, helixes, spark gaps, anchor gaps, leyden jars, induction coils, transformers, keys, aerial switches, tuning coils, loading coils, loose couplers, variometers, fixed condensers, silicon, electrolytic, carborundum, perikon and audion detectors, telephones, potentiometers, etc., you can find them all and how to connect. A hook-up for any set accompanied by full explanation. None are missing. They are all there. There are no two alike.

The most complete and reliable data ever collected. The result of thousands of experiments by some of the most famous wireless experts in the country.

Read now before the supply is exhausted or you forget. You will be sorry if you don’t.

Price, 25 Cents, Postpaid

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The Operation of Wireless Telegraph Apparatus

Do your Wireless friends come to you for advice on constructing and operating their apparatus or do you go to them for information?

Here is a chance for YOU to become the authority.

This book is a necessity to every Progressive Experimenter.

It shows how to obtain the very highest efficiency from any station, and how to comply with the law. How to tune, adjust your detector, spark gap, phones, etc.

Price, 25 Cents, Postpaid.

This book was written for the wireless experimenter who has passed the amateur stage, but explains how the beginner also can obtain the very best results from his station. It contains much useful information to this end and many "kinks".

IT SHOWS HOW to receive or send on long or short wave lengths with highest efficiency, to tune for longest distance reception of messages, to use the buzzer test, how to test and connect condensers, receivers, etc., how to use receiving transformers, variometers, etc., all with highest efficiency in view.

IT ALSO DESCRIBES the construction and use of a simple, inexpensive wave meter to tune the station to any desired wave length, and tells how to obtain a sharp wave and a pure wave.

EXTRACTS FROM THE LAW are also given in such a manner that they are easily understood.

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How to install them. By N. H. SCHNEIDER. Including batteries, wire and wiring, circuits, pushes, bells, burglar alarms, high and low water alarms, fire alarms, Thermostats, annunciators, and the locating and remedying of faults. With 56 original diagrams.

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A practical handbook on the construction and working of Wimshurst machines, including radiography and wireless telegraphy and other static electrical apparatus. By A. W. Marshall. Second edition, revised and enlarged. Containing a number of sectional drawings and details to scale. Contents of chapters: 1. Introductory. 2. Static Electricity. 3. The electrophorus. 4. The Electroscope. 5. Condensers. 6. The Leyden Jar. 7. The Parts of a Wimshurst Machine and Their Use. 8. Making and Management of Wimshurst Machines. 9. Some Examples of Wimshurst Machines, small machines. 10. Complete detailed drawings and particulars for the construction of a 24-inch plate machine. 11. The Wimshurst machine for X-ray work with detailed drawings. 12. Experiments for Wimshurst machine. 112 pages, 30 illustrations and plates.

By Newton Harrison. A comprehensive explanation of the making of a Wireless Telephone Equipment. Both the transmitting and receiving stations fully explained with details of construction sufficient to give an intelligent reader a good start in building a Wireless Telephone system and in operating it. 74 pages and 43 illustrations.

Specially applicable to Country Houses, Farms, Small Settlements, Launches, Yachts, etc. By Norman H. Schneider. Giving full details and illustrations of the most up-to-date small American Plants. Contents of chapters. 1. Introduction. 2. The Storage Battery. 3. Estimating the Installation. 4. The Electric Plant. 5. Some Typical Plants. 6. Installation and Operation. 95 pages, 27 illustrations.

by A. F. Collins. Complete and detailed data for constructing a five to ten mile set, also a ten to twenty-five mile set. 1. A five to ten mile tuned transmitter. 2. A five to ten mile tuned coherer receptor. 3. A five to ten mile tuned auto-detector receptor. 4 and 5. A ten to twenty-five mile tuned transmitter. 6. A ten to twenty-five mile tuned coherer receptor. 7. A ten to twenty-five mile auto-detector receptor. 80 pages, 63 illustrations.

by A. Frederick Collins. Complete and detailed instructions for making an experimental set, also a one to five mile set. 1. An experimental transmitter. An experimental receptor. 3. A one to five mile transmitter. 4. A one to five miles coherer receptor. 5. A one to five mile auto-receptor. 55 pages, 37 illustrations.

By W. G. Aston. Contents of chapters: 1. General principles and their application. 2. Power. 3. Supporting surfaces. 4. Screws, and how to make them. 5. Tails and elevators. 6. Fins. 7. Designs. With a number of examples of monoplane, bi-plane, tandem bi-plane and tri-plane models. 8. Dirigibles. 9. Helicopters. 10. Ornithopters. 11. Winding apparatus. 12. Compressed air motor. A first-rate book for Model Makers, 125 pages, 95 illustrations, 12mo. boards, postpaid, for 550.

How to Make and Fly Them. A booklet with one large sheet containing twelve butterflies and two birds in colors and material for making a small card-board Model Aeroplane Glider. Complete in folder, postpaid, for 55c.

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A large scale drawing of this prize-winning Monoplane. With all measurements and details showing a front elevation, a side elevation and a top elevation; with 8-page descriptive booklet of particulars postpaid, 15c.

that will carry a man. By A. P. Morgan. A practical handbook on its construction and management. Enabling an intelligent reader to make his first step in the field of aviation with a comprehensive understanding of some of the principles involved. Fully illustrated with detailed drawings. Contents of chapters: 1. The frame work assembling and finishing the wood. 2. Covering the planes, laying out the fabric and fastening it. 3. Trussing, fastening the tie-rods and trueing the glider. 4. Gliding flight, the principles involved, instructions and precautions. 5. Remarks. 60 pages, 31 illustrations.

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*** END OF THIS PROJECT GUTENBERG EBOOK MODEL FLYING MACHINES ***