BOOKS ON AERONAUTICS.
RESISTANCE OF AIR AND THE QUESTION OF FLYING. By A. Samuelson. An important lecture of considerable interest to those interested in Aeronautics. Contents: Introduction. The Resistance of Plastic Bodies. Air-pressure on Flat Bodies. The Centre of Air-pressure. Distribution of the Air-pressure on the Single Elements of an Inclined Plane. The Normal Air-pressure on a Thin Plane Inclined at an Angle to the Direction of Motion. Lilienthal’s Balance of Rotation. The Numerical Value of the Normal Pressure. Flying in General. Flying in Reality. Horizontal Flight by Wing-Flapping. Steering and other Effects of the Stroke. Conclusions. 23 illustrations, 8vo., paper. 75c.
FLIGHT-VELOCITY. By A. Samuelson. This work is a short comprehension of extensive scientific investigation and experimental work. Contents: The Rowing Flyer No. 5. The Motor Mechanism. The Fundamental Conditions of Flying by Wing Flapping. The Wings. The Re-sail. Flight Velocity. Living Flyers. Plane or Concave Supporting Surfaces. The False Resolution of Forces. The Erroneous Opinion: the Breadth of an Incline Plane Prevails over its Length. The Centre of Air-pressure, and the Distribution of the Pressure. On the Single Parts of an Inclined Plane. The Principle: the Normal Air-pressure of an Inclined Plane is independent of the Angle of Inclination. Tables of Motion at Varying Angles. The Human Flight. Conclusions. With five plates, 8vo., paper. 75c.
FLYING MACHINES. Past, Present and Future. A popular account of flying machines, dirigible balloons. By A. W. Marshall and H. Greenly. Whilst the matter in this book is intended as a popular exhibition of the subject, it includes information which will assist the reader with serious intentions of making an attempt to produce a flying machine or air-ship. A great deal of sound experimental work has been done, forming a basis upon which future plans can be calculated. An account of some of this work is here given. Contents of Chapters: 1. Introduction. Dr. Barton’s Air-ship. Lebaudy’s Military Air-ship. The Deutsch Air-ship. The Wellman Air-ship. Motors of the Wellman Air-ship. Chapter 2. Dirigible Balloons. Giffard’s. Dupuy de Lome. Tissandiers’. Krebes’. Santos Dumont’s, No. 6 and No. 9. Spencer’s Air-ship. Barton’s. Maxim’s Flying Machine. Archdeacon’s Air Propeller Cycle. Barton’s, Rawson’s, Baulx, Zeppelin, Deutsch, Lambert, Wellman’s Air-ships. Trolanini’s Air-propelled Boat. Chapter 3. Flying Machines. Giving a Number of those made by Hargrave and also by Phillips, Ader, Maxim, Pilsher’s Soaring Wings, Langley, Bastine, Bleirot, Voison, Wright’s Gliding Aeroplane, and numerous others. Chapter 4. The Art of Flying. Chapter 5. Flying Machines of the Future. 134 pages, illustrations and page plates, 12mo. 50c.
MODEL AEROPLANES.
MODEL FLYING MACHINES, THEIR DESIGN AND CONSTRUCTION. 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 55c.
MODEL GLIDERS, BIRDS, BUTTERFLIES AND AEROPLANES. 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.
MODEL AEROPLANES, HOW TO BUILD AND FLY THEM. By E. W. Twining. Consisting of one booklet and five large scaled drawings for three Twining Models, two of them being of the Bi-plane Glider type. Complete in folder, postpaid, for 55c.
TWINING’S MODEL NO. 2. A complete set of the materials in the rough, including the rubber of a Bi-plane Model without the drawings, postpaid, for 65c.
TWINING'S MODEL NO. 3. A complete set of materials in the rough with rubber for the construction of this handsome Model Bi-plane without the drawings, postpaid, for $1.15.