100-TON BUCKTON MACHINE. 65 



THE BUCKTOX-WICKSTEED 100-TOX VERTICAL 

 MACHINE. 



31. A better known one than the 50-ton machine which 

 has just been described, is the 100-ton machine, also 

 designed by Mr. Wicksteed, and made by Messrs. Buckton, 

 of Leeds. The principle and the general arrangement are 

 precisely the same as before. The detailed design varies 

 greatly in different machines, and no two are precisely alike. 

 In addition to appliances for tension testing, most of the 

 more recent machines are provided with arrangements 

 whereby tests in compression, bending, and sometimes tor- 

 sion, can be carried out. These will presently be described. 



In most of the 100-ton machines the main knife edge is 

 supported on the top of a hammer standard, as in the 

 machine last described ; in several, a casting resting upon 

 four circular pillars supports the beam. 



By this last arrangement the specimen which is being 

 tested is more accessible on all sides, and also it is more con- 

 venient for compression tests, where the compression plates 

 are guided in a truly vertical direction by being made to 

 slide upon four planed surfaces formed on the inner sides 

 of the pillars. 



In the case of one machine, that at the Yorkshire 

 College, Leeds, the standard, which is of the hammer type, 

 is of exceptional height, its base being some distance below 

 the floor of the testing room. A tension specimen 

 10 ft. long may be broken in the machine. This machine 

 is so arranged that the operator stands upon a platform 

 which can be raised or lowered in order that readings can 

 be taken at any point on the specimen. 



In two, at least, of these machines, namely, that at 

 the Central Institute of the City Guilds of London, and at 

 the Yorkshire College, Leeds, the ordinary capacity is only 

 50 tons, but by hanging a deadweight at the end of the 

 lever of such a magnitude that it is equivalent to 50 tons load 

 on the specimen, the capacity is increased to 100 tons. 

 When using the machine for loads beyond the 50 tons, the 

 poise weight is first moved outwards until the load has 

 reached 50 tons. It is then brought back to the zero 

 point, the stationary load hung on the end of the lever, 

 and the test proceeded with. 



The machines at University College, Liverpool, *Brad- 

 ford Technical College, and Edinburgh University have 



* Engineering, 1896. 

 F2 



