W. Hallock — Flow of Solids. 



279 



h h are strips of tissue paper used as packing between the two 

 halves. I I, fig. 1, are the two pins acting as pistons fitting into 

 the hole F,- transmitting the pressure, a a are copper "gas 

 checks " placed in front of the pins to flare out and fill tightly 

 the hole F, preventing any escape of material. Figs. 1 and 2 are 

 } natural size, the hole was 1 inch in diameter. Fig. 3 (scale ^) 

 shows the manner in which the apparatus was held in the testing 

 machine, and the pressure applied. P and P are the jaws of 

 the hydraulic clamps of the machine (capacity 1,000,000 lbs). 

 H H blocks of steel. N also a steel block, holds the back (left 

 hand, stationary) pin in place. V V is the clamp of the fixed 

 end of the machine where the pressure is weighed. To apply 

 the pressure the clamp P P is forced toward Y V by a hydraulic 

 piston, thus forcing the holder E E over the pin resting against 

 O. In this manner a total compressive force of 1,000,000 lbs. is 

 available, carefully and delicately weighed by the hydraulic 

 balance of the machine. The pins yielded at 110,000 lbs. per 

 square inch, hence in the experiments only 96,000 lbs. per 

 square inch or 6,400 atmospheres was used. 



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Experiments. — The amount of work done was computed 

 from the load and compression, which showed that the possible 

 heat generated would disperse into the holder and produce only 

 an extreme rise of a few degrees centigrade. 



