BuL. U. S. B. F., 190S. 



Plate XCIII. 



Fig. 7. — Lifting Uic disconnected propeller out of the water. The upper por- 

 tion of the shaft ^\ith the sleeve coupling is seen at i. 



Fig. S. — The propeller removed, showing disconnected shaft. The upper part of the shaft and 

 the coupling are faintly visible under the shaft beam. The photograph shows well the size 

 and shape of the propeller blades. 



