FIG. 3. PL.I 
SECTION THROUGH TRUNNION-PL ATE^TRUNNIONS 
AND PIVOT BLOCK. 
V MAY 24 1233 ) 
<*> r ' < ^- 
Nc <^j ffi8T Q gjL 
ELEVATION OF BREECH END WITH CASCABLE 
PLATE REMOVED. 
E CARRIER. 
