72 ADAMSON MACHINE. 



pressure supplied from an accumulator. The straining 

 is effected by the pressure of this high-pressure water 

 on the upper side of an hydraulic piston. When a test 

 is complete the water is released from the top of the 

 piston and applied to the bottom, so as to cause it to return 

 to its normal position. 



Not only the straining, but the regulation of the load 

 also, is effected by hydraulic means, it will be seen from 

 the illustration that there is a horizontal hydraulic cylinder 

 below the main lever. When the water under pressure is 

 admitted to this cylinder the ram is forced out, and through 

 a simple system of multiplying pulleys and cords, the poise 

 weight is pulled along the beam and the load on the speci- 

 men increased. At trie end of a test the poise is brought 

 back to its zero position by the balance weight, shown to 

 the left of the figure. A parallel motion on the poise 

 weight keeps the pull of the cords always horizontal; and 

 prevents their tension affe'cting the load on the specimen. 

 Its use is limited to tension testing. The accuracy of the 

 machine is guaranteed to 1 in 5,000 arid" it is designed to 

 test with this degree of accuracy samples at the rate of 

 (50 per hour, and a record is said to have been reached 

 with lighter specimens of 120 in the hour ! The machine 

 illustrated is in use at the Dowlais-Cardiff works. 



HORIZONTAL COMPOUND-LEVER TESTING MACHINE. 

 BY MESSRS. DANIEL ADAMSON AND Co., HYDE. 



38. The two last machines which have been described, 

 namely, the Werder and Buckton-Wicksteed, are both of 

 the single-lever type. We next come to the compound- 

 lever machines, of w r hich the one designed by the late Mr. 

 Daniel Adamson will be described first. The general 

 arrangement of the machine has already been shown on 

 Fig. 19 (a). A side elevation of a 100-ton machine of 



this type is shown on Fig. 29*. The machine is 



i i i 



arranged to test specimens in the horizontal position. 



All the parts are carried upon one cast - iron box 

 framing, so that the machine is quite self-contained. 

 At the left-hand end (as shown on the diagram) is an 

 hydraulic cylinder, fitted with a ram, which moves in 

 an outward direction towards the left. This is the strain- 

 ing cylinder, by means of which the strain of the specimen 



* Journal of the Iron and Steel Institute, 1888. 



