AERODYNAMICAL EXPERIMENTS UPON A YACHT'S MAINSAIL. 9 



agreement and indicate that the English tunnel and balance have lost none of their 

 precision in the rather extensive alterations that have been made here. 



The wind tunnel has been in operation since July, 1914, and has been used for 

 comparison of Pitot tubes, determination of the aerodynamic coefficients for a num- 

 ber of wings, bodies and miscellaneous objects, for thesis work on aeroplone stabil- 

 ity and by students in connection with problems arising in the course of aeroplane 

 design. 



