370 Method of obviating the Necessity of lifting Ships* 
them out forward and aft, and stop the ship up, by lay- 
ing one iron wedge on the other, as shown at Fig. 1, 
Plate 10. 
To facilitate the business, blocks may be cleared for- 
ward and aft at the same time, sufficient to get in place 
one length of false keel. If the false keel should want 
repairing, it may be done without any additional shores, 
by clearing one block at a time ; and when the keel is 
repaired in the wake of that block, return the wedges, as 
above directed, and clear the next, &c. 
Section and Plait, Plate 10, Fig. 2. 
A, Keelson. 
B, Ceiling. 
C, Floor timber. 
B, Bead or rising wood. 
E, Plank of the bottom. 
F, Keel and false keel. 
G> Angular blocks with a half-inch iron-plate bolted 
to them. 
H, Cast-iron wedges. 
I, Iron-plate of three-fourths of an inch thick on the 
bottom of the dock. 
K, Battering-rams, with wheels, and ropes for the 
hands. 
L, Cast-iron wedges, having received a blow from 
forward. 
M, Shores under the ship to sustain her weight. 
Fig. 3, represents part of a top-gallant mast fitted with 
a wedge fid. 
a , Top -gallant mast. 
b , Fid, with one horizontal wedge worked on it. 
c, Moveable wedge, with the iron strap and pin over 
it, to keep it in its situation. 
d, Trussel trees. 
