•460 On the comparative Strength of Chain Cables. 



1, 1 1, Ij, 1|, 1^, 15, 11, and 1| inches: at a strain of 40 

 toiis the cable was reduced to 12 inches: the strain of 40 tons 

 was coiitiiuied, and the cable was broken." 



Bxfteriment 2. — "A 16 inch cable was attached to the chains; 

 the rope was reduced at 40 tons to 13^ inches: the 1 inch chain 

 vvds broken by a strain of 44 tons." 



Experimtnt 3. — " The cable was tlien attached to the chain 

 from li to 1| inch inchisive: the cable was broken at 47 tons." 



Eocperiment 4. — "The chains were then put to an 18 inch 

 cable, and a further piece of chain of 1| inch was attached. 

 At 55 tons the rope was reduced to 16} inches, the 1| inch chain 

 was broken at a strain of 55 tons : the cable, which then mea- 

 sured 15| inches, was affixed to the other remaining chains, and 

 was broken by a strain of 59 tons." 



Experiment 5. — " A 20 inch cable was tried. The chain of 

 1| inch broke at a strain of 62 tons. Upon affixing the cables 

 again, a piece of 1| inch chain broke at a strain of 66 tons: the 

 iron of which it was made was good, but very malleable. 



"When 71 tons had been applied, the cable was reduced to 

 17| inches. At a strain of 75 tons the second piece of 1| inch 

 chain was broken ; the cable was reduced in size to 17 inches, 

 and was broken at a strain of 76 tons; the smallest size of chain 

 in the machine being 1| inch." 



Experiment 6. — " A 24 inch table was put into the machine. 

 The 1| inch chain was broken at a strain of 80 tons: the rope 

 was then attached to the other chains: when 92 tons had been 

 applied, the cable measured 21 inches; vvhen 105 tons were put 

 upon it, the cable had evidently suffered very much, and measured 

 20| inches: it was broken with a continuance of the strain of 

 105 tons." 



Lord Chief Justice. — " And the chain remained ? " A. " Yes, 

 my lord." 



"As it was considered that the 18 inch cable had not borne a 

 sufficient strain (comparatively with the other sizes) to draw any 

 accurate conclusion of the strength of ropes of tliis size, a dupli- 

 cate of the IS inch cable was put into the machine, and was 

 broken by a strain of 63| tons, which is about the force that it 

 was considered should break an IS inch cai)le." 



Mr. Scarlett. — " And the result was an order for the chains 

 of Mr. Brunton?" — "Yes; by sharing it between him and 

 Brown." 



" The twisted cable was consequently dismissed?" — "Yes." 



" And has been used since?" — " Those in store were neces- 

 sarily used, but they were not further ordered." 

 Cross-examined ly Mr. Gaselee. 



"These experiments were against the twisted chains only? — 

 ^' Yes ; Capt. Brown requested, in a letter of the 4th of April 



1S16, 



