326 



ME. W. DUDDELL ON THE RESISTANCE AND 



01234 5""6" "7 3 9 10 u n a 14 15 16 17 is a 20 21 22 ;; r-i 25 26 27 28 29 30 mm. 



Arc LengCh. 



e 

 < 



2 3 4 56 7 89 I01II213I4I5I6I7I8I92O21222324 25iim. 



Arc Length. 



