"Mid-way between the two main surfaces and at the front of each end is a small plane. These are tilted at positive and negative angles to the wind, by means of cords connecting them with a pivoted bar moved by the pilots feet. In flight, if one end rises, the aviator presses down the end of the bar on the rising side. This causes the 'balancing plane' on the high side, which is the name given to the movable planes just described, to form a negative angle with the wind so that the high side is forced down. The other balancing plane assumes an equal positive angle, so as to force up the lower side. Thus the machine is again brought to an even keel. After a little experience, this action becomes almost automatic, so that no difficulty is experienced in keeping the flyer level.
"The motor, which at present has not been installed, will be supported between the two main planes and connected to a laminated spruce propeller, six feet in diameter.”
Those who of until late have not been associated with aeronautics can scarcely realize the steps by which aviation had progressed and the trend towards building machines.
The aeroplane worker can no longer be classified with the seeker after perpetual motion. It is therefore to be lamented that so many of these machines partake of freak construction. Originality is always to be fostered but must bear some degree of proportion.
Only a very few favored people in comparison to the rest of civilization have been enabled to see an aeroplane in flight. Many times less are those who have had the privilege of examining a successful machine.
BOOKS FOR AVIATORS
THE BAROMETRICAL DETERMINATION OF HEIGHTS. A practical method of barometrical leveling and hypsometry. By F. J. B. CORDEIRO. With an appendix on the Air-Barometer. Full limp leather, $1.00.
TABLE OF BAROMETRICAL HEIGHTS TO 20,000 FEET. Computed by William H. Mackesy. The tables are mainly intended for use with the compensated mountain aneroid barometer but they are also suitable for the mountain mercurial barometer. A valuable little set of tables.
THE ATMOSPHERE ITS CHARACTERISTICS AND DYNAMICS. By F. J. B. CORDEIRO. In producing this work the author has endeavored to place before the public valuable data and information collected by him as to the origin of hurricanes, their causes and other atmospheric disturbances. In view of the fact that so much interest is now being taken in the navigation of the air every scrap of information that can be collected relative to atmospheric conditions will prove of considerable value to all those interested in this new science. The work is divided under the following headings:—Constitution. Temperature and density. Convective equilibrium. Various atmospheres. Aqueous vapor. Pressure of air. Practical barometry. Motion relative to the moving earth. Vertical motion. Horizontal motion. Frictionless motion over a rotating spheroid. Motion on the rotating earth without friction. General circulation of the atmosphere. Equatorial circulation. Polar Circulation. Middle circulation. Planetary circulation. Cyclones. Porto Rican hurricane of August 8, 1899. Horizontal velocity. Tornadoes. Other Phenomena occurring in the atmosphere. Sound. Merged explosions. Optical phenomena. The rainbow. Atmospheric conditions in relation to flying machines, etc. With numerous tables and 34 illustrations, 4to. Paper covers $1.50, full cloth, $2.50 net.
THE THEORY AND PRACTICE OF MODEL AEROPLANING. By V. E. Johnson, M.A. The object of this book is to give in plain language the general practice and principles of Model Aeroplaning. Model propellers and motors have been carefully dealt with, and much valuable data included from the author’s own experiments. Contents of Chapters.—Glossary of Terms used in Model Aeroplaning. Introduction. The Question of Weight. The Question of Resistance. The Question of Balance. Motive Power. Rubber Motors and other forms of Motors. Propellers or Screws. The Question of Sustention. The center of pressure. Materials for Aeroplane construction. Hints on the building of Model Aeroplanes. The Steering of the Model. The Launching of the Model. Helicopter Models. Experimental records. Model Flying competitions. Useful notes, tables, formulae, etc., etc. 163 pages, 82 illustrations, 12mo cloth, $1.50.