WILLSON. — ALTITUDE OF AEROPLANE FLIGHTS. 



37 



and naturally contains more errors and uncertainties, but in no case is 

 the height uncertain by so much as five feet. 



TABLE III. 



Flight of Brookins, Sept. 10, 1910. Wright Biplane. Base Llve 6236 

 FEET, Course 13 feet above Mean Low Water. 



The third llight, Figure 2 Qeft), is that of Grahame-White on Septem- 

 ber 1 2, immediately preceding that of Brookins. The seventh observation 

 shows a corrected vertical angle at Milton, and the twelfth a correction 

 of the horizontal angle at the same station, — one of two instances de- 



