IMPROVED JURY MAST AND SHBOUUS. ■ 359 



trees or top as in common, and the mast rigged as usually. 

 The object of the strengthening cap, G, is to steady the 

 spars, and also serves to fid the topmast on, if thought 

 necessary," 



I haye the honour to be, 



Your obedient humble servant, 



WM. BOLTON. 



Meference to ike Dram'ng of Captain Bolton^ s Rig-gedJuri/ 

 Mast, and his improved Mode of securing the Shrouds^ 

 fl. IX, Fig. 1, 2, 3, and 4. 



A A, fig. 1, represent the partners or pieces of timber, Expfenatlftn of 

 ■which are bolted to the quarterdeck for the mast to rest* ^ P *^'^- 

 vpon, 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 « are fixed; two mortices must be cut in the 

 partners A A, to receive squares made at the lower ends of 

 the two temporary masts DD, which are supported by the 

 caps a a, one of theiJi is a spare main topmast, the other 

 a hand-jnast; these two support the main top E, additional 

 squares being made on the tressel trees to receive each of 

 them, 6 is a cap shown in fig. 3, made of four-inch plank 

 doubled for the purpose, and fitted upon the heads of the 

 aiasts D D, for a fore topmast 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. 4, on which it fids ; as it does finally on the 

 top. The topgallantmast H is fixed to the topmast F by 

 the top and cap in the usual manner. The figures 3 and 4 

 show the caps separated from the masts, and are the only 

 things necessary to be made for the purpose; and the ob- 

 ject of the cap, fig. 4, is to steady and prevent any Avriog- 

 ing of the lower jury mast, and to fid the topmast when- 

 ever it is reefed. In the proposed method of securing the 

 shrouds of ships in general, I represents the screws with 

 loop holes for the shrouds to be lashed to, and K the screw- 

 nuts, which by means of a proper wrench may be easily 

 turned, so as to tighten or slacken the shrouds at pleasure. 



The 



