334 



Ti:sTIN<; HI' I'MllTI.AND CKMKNT. 



The crushing load may be obtained in any ordinary 

 testing machine provided with compression plates, or a 

 special machine may be used. One of these, by Messrs. 

 Bailey, is shown on Fig. 108. This is an hydraulic press 

 in which the load is increased by a screw plunger worked 

 by hand as shown. The cube is fixed tight between the 

 compression plates by the adjusting screw shown, which 

 is also worked by hand. The load on the specimen is 

 given at once by the position of the pointer of a pressure 



FIG. 168. TESTING MACHINE FOR COMPRESSION CUBES OF CEMENT. 



gauge, which is arranged to retain its maximum position 

 after the specimen has failed by crushing. The fluid used 

 in these machines is glycerine or oil. Messrs. Bailey make 

 this machine in three sizes, suitable for working up to 

 maximum loads of 12, 60, and 150 tons respectively. 



Bedding Compression Specimens. The most impor- 

 tant point to be noted in testing cement or other brittle 



