208 



ANIMAL MECHANICS. 



Wing of Macaw. 



Angle. 



I - I'. 



I cos 9. 



V cos 9. 



o° 



42 



39 



8 



IO 



4 6 



47 



9 



20 



54 



58 



9 



30 



70 



77 



10 



40 



96 



106 



10 



50 



106 



i'5 



10 



60 



114 



120 





70 



127 



126 



1 1 



80 



143 



127 



1 1 



90 



112 



9i 



1 2 



From these measurements, I obtained the following re- 

 sults, by calculation : — 



Wing of Macaw. 



Angle. 



1 



Q f I') cos 9 1 

 l-V 



IV cos 2 9 



I - r~ 



0° 



0. 02381 



\. 1 191 



7-43 



10 



0. 02174 



1.2174 



9. 19 



20 



0.01852 



1.2407 



9.66 



30 



0.01415 



1.2429 



1 1 . 00 



40 



0. 01041 



1. 2084 



1 x . 04 



5° 



0.00943 



r. 1793 



10.85 



60 



0. 00877 



1. 1491 



11.58 



70 



0.00787 



1.0787 



10. 91 



80 



0. 00699 



0.9650 



9.76 



90 



0. 00893 



0. 9196 



9-75 



Sum, 



0.13062 



11.3202 



101.17 



lience we find, for the distance of the centre of the Conic 

 (66), from the vertex 0, 



The actual distance of the axis ST, passing through the 

 socket $, is 45. 



