"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.
*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.