Adams <& Colcer — The Flow of Marble. 



469 



Kick, in which a stout copper case is prepared within which 

 the specimen is placed, the intervening space being filled bj 

 alnro, sulphur or some other more or less plastic material, 

 poured in when in a fused condition and which solidifies on 

 cooling. (Fig. 1.) The whole is then submitted to the action of 

 a powerful press and squeezed down. Upon the completion of 

 the experiment the embedding material is removed bj heat or 

 solution and the deformed specimen obtained. This method 

 is easily carried out, but it has a number of defects. Thus, 

 the experiments can be carried out only at the ordinary tem- 



FlG. 1. 



™ EMBEDDING 



MATERIAL 



^XA$$ PLATE 



I , I . I ■ I ■ I ■ I 

 CENTIMETERS 



perature of the laboratory ; the lateral resistance offered is not 

 as great as is required in the case of the harder rocks, and it is 

 furthermore impossible to determine the pressure to which the 

 specimen has been subjected, seeing that the load has been 

 divided between the box, the embedding material and the 

 specimen itself. 



A series of experiments on the deformation of various 

 minerals and rocks were, however, carried out by this method, 

 the results of which are detailed in another paper.* 



The second method is that employed by Adams and Nicol- 

 son in their investigations on the Flow of Marble. In this a 

 column of the rock is very accurately turned or ground in a 

 lathe and fitted into a heavy tube of steel which has been 

 bored out with equal accuracy to receive it. Pistons of hard- 

 ened chromium-tungsten steel are then inserted into the ends 

 of the tube, the pressure being transmitted through them to 

 the column enclosed in the steel. By this method a much 

 greater lateral resistance can be secured, which makes it 

 possible to carry out the deformation under much higher 



* Adams, F. D. — An Experimental Investigation into the action of Differ- 

 ential Pressure on certain minerals and rocks employing the process sug- 

 gested by Professor Kick ; Journal of Geol., 1910. 



