Bull. U. S, F. C. 1896. (To face page 348.) 
Plate XXX. 
Fl^. I t ^ ]^\g. Z. 
DREDGING BLOCK. 
Xo}ae)\clatnre. 
a. Fi’anie. 
b. Slieave. 
c. Pin. 
<1. Shackle bolt. 
p. Sliackle. 
/. Shackle pin. 
//. (xuard. 
h. Hood. 
i. Pusliin^a. 
