Improved Jury Mast and Shrouds . 810 
168 in the last volume, after the full stop at main-top 
and substitute the following : 
66 The spare fore top mast passes through a cap made 
from strong plank, 5, into the square holes of which the 
heads of the two temporary masts above mentioned are 
inserted, and the heel of the top mast is lidded on the 
tressle trees or top as in common, and the mast rigged as 
usually. The object of the strengthening cap, Gr, is to 
steady the spars, and also serves to fid the top mast on, 
if thought necessary.” I have the honour to be, &c» 
Wm. Bolton* 
j Reference to the Drawing of Captain Bolton’s Jury 
Mast , his Digged Jury Mast , and his improved Mode 
of securing the Shrouds . 
Plate 5.— Fig. 1, 2, 3, 4, 5 . 
A A, fig. 4, represent the partners or pieces of timber, 
which are bolted to the quarterdeck for the mast to rest 
upon. B is the stump of the lower mast, which is cut 
square at the top, and of the same size as the head of 
the mast originally was ; upon this square the main and 
spare lower caps a a are fixed ; two mortices must be cut 
in the partners A A, to receive squares made at the low- 
er ends of the two temporary masts I) D, which are sup- 
ported by the caps a a , one of them is a spare main top 
mast, the other a hand-mast ; these two support the main 
top E, additional squares being made on the tressel trees 
to receive each of them. & is a cap shown in fig. 
made of four-inch plank doubled for the purpose, and 
fitted upon the heads of the masts I) 3), for a fore top 
mast F F, the heel of which, when struck, rests in a 
mortice made in the stump of the lower mast ; it is also 
steadied by a double cap G, separately shown in fig. S, 
* Emporium, p, 217, line 4 from the. top 
