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Hawke's Bay Times, Volume 14, Issue 738, 25 November 1869, Page 2

Spring for Chain Cables—We (Syd ney Morning Herald) have seen a mode) of Mr J. Evelyn Liardet’s spring for chad cables, for the use of ships at anchor, or moorings of any kind whatsoever. This spring consists of ten indiarubber rings, each 2£ inches diameter, and one inch in thickness. Five of these rings are placed on a piston rod ; between the first three a wooden washer is placed, so as to divide the elasticity of the indiarubber, and an iron washer is passed into the piston, and strongly screwed on to the piston by means of a worm and nut; in an opposite direc tion is a similar piston, with five indiarubber rings similarly fitted and placed. The two piston rods are encased in an iron cylindrical casing, consisting of six i-ineh iron bars, well screwed and nutted at each end to an £-inch iron round plate of fom inches diameter, through each of which iron plates the piston rods work according to the pressure. The whole apparatus is only 18 inches long. Mr Liarclet has jusi had this model tested at Messrs P. IS. Russell and Co.’s foundry in Rathurst-st The result of the test is as follows “Length of indiarubber on each piston rod before the test, three thicknesses, each one inch; two ditto, ditto ditto; length of indiarubber after test, returned to its original state without injury in any way to model. Result of test: At a pressure oi one ton the indiarubber spring on each piston rod gave one inch and fifteen-six-teenths. Signed, J. S. Mayer, Foreman, Boilermaker. J. Evelyn Liardct, Inventor, Sydney, 2nd October, 1809.” Mr Liardct only intended this model to bear a strain of twelve cwt., therefore the result has very much more than exceeded his expectations, and the spring no doubt will prove itself to be most useful to all classes oi ships, and become generally used. Om on a large scale Mr Evelyn Liardet is now about to use in mooring his raft to breal the sea in the inner reef off' Nobby’s, ai Newcastle, and wo hope ho will be success ful.