Owing to the confidential character of the information upon which the compilation of the accompanying charts is based, it is not advisable to give the names of the thirteen engines considered, but it may be stated that the revolving type has been eliminated and none but the fixed type are employed in compiling the various diagrams.
In a paper presented to the Society of Automobile Engineers, Elmer A. Sperry called attention to the faults of the magnetic compass for aeronautical work, the most serious of these being its inaccuracy when the machine is banked, and its tendency to lag in action, due to the swirling of the liquid in the bowl.
A semi-official account of the work being done by the Aviation Section, Signal Corps, U. S. A., indicates in a the great strides that have been made in American Military Aeronautics since the President signed, at the end of last August, the appropriation bill carrying $13,281,666 for military aeronautics.
The B.E.2, mentioned in Section 12, will serve as an example of the estimate of the total parasite resistance of a machine. The estimate was arrived at by the Royal Aircraft Factory after the most careful tests, both at the N. P. L. laboratory and in full flight, and is given in Table 1.
ANY forecast ot the developments likely to take place in the aeronautical industry this year is extremely dangerous because the possibilities of the industry are unlimited. Primarily, however, the development for 1917 is likely to be of a military character.