ANIMAL MECHANICS. 



313 



The actual distance of the socket S from the line OF is 

 3%nds of an inch. 



(c.) Wing of the Heron. — The following measurements were 

 made upon the wing of the Heron, in 32nds of an inch. 



Wing of Heron. 



Angle. 



l-V. 



I sin 0. 



I sin 9. 



0° 



28 



4 21 



4 9 



5 



38 



4 18 



4 6 



IO 



48 



4 16 



4 4 



*5 



65 



+ 1 1 



4 3 



20 



83 



+ 5 



4 1 



25 



100 



- 4 



- 1 



3° 



1 1 1 



- 16 



- 2 



35 



121 



- 28 



- 3 



40 



126 



--tl 



- 4 



. 45 



122 





- 5 



From these measurements, the following Table is calcu- 

 lated : — 



Wing of Heron. 



Angle. 



I -C 



(l+l') sin 0 

 I - I' 



IV sin 2 e 

 I -I' 



o 8 



0.03571 



4 1.0714 



6 -75 



5 



0.02632 



+ 0. 63 1 6 



2. 84 



10 



0.02083 



4- 0.4166 



i.33 



15 



0.01539 



40.2154 



0.5*1 



20 



0.01205 



4 0.0723 



0. 06 



25 



0. 01000 



- 0.0500 



0. 04 



3° 



0. 00901 



- 0. 1622 



0. 29 



35 



0.00826 



- 0.2562 



0 70 



40 



0.00794 



- 0-365 1 



'•33 



45 



0 00819 



- 0.4508 



2.05 



Sum, 0-15370 



1-1230 



15-90 



From these values, we find, 



Q 2 - 4^—8.514, 



