49 IMPROVED JURY MASTS* 



Ixpianarion of In PI. I, figs. 1, 2, and 3, A A represent the partners el? 

 e P» te - pieces of timber, which are bolted to the quarter deck 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 ib the partners A A to receive squares made at the 

 lower ends of the two temporary masts D 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, b is a cap shown in fig. 2, made of 

 four inch plank doubled for the purpose, and fitted upon 

 the heads of the masts D D, for a fore topmast F F, the 

 heel of which rests in a mortice made in the stump of the 

 lower mast ; it is also steadied by a double cap G, sepa- 

 rately shown in fig. 3, on which it fids finally on the top* 

 The topgallantmast H is fixed to the mast F by the top 

 and cap in the usual manner. The figures 2 and 3 show 

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

 necessary to he made for the purpose ; and the object of the 

 cap, fig. 2, is to steady and to prevent any wringing of the 

 lower jury masts, and to fid the topmast whenever it is reef- 

 ed. The fore topmast FF appears in two separate pieces, 

 •n account of its length. 



Till. 



An Improvement in the Construction of Anchors, to render 

 them more durable and safe for Ships: with an improved 

 Mode of Fishing Anchors. By Captain H. L. Ball, of 

 the Royal Navy*. 



SIR, 



Anchor itockt J[_ HE great expense of timber in the navy for anchor 

 Squeatlv fail. stoc ^ s » an< * the frequency of their failing or giving way in 



* Trans, of the Society of Arts, Vol. XXVI, p 170. The silver me- 

 dal of the Society was voted to Capt, Ball for these improvements. 



the 



