ON AN EXPERIMENTAL 
INVESTIGATION INTO THE FLOW OF 
MARBLE. 
383 
the Carrara marble, enclosed in its iron tube, was slowly deformed while at a 
temperature of 300° C., but in the presence of water vapour under a pressure of 
460 lbs. to the square inch. The deformation was carried on very slowly and at as 
Fig. 8. 
uniform a rate as possible for a period of 54 days, or nearly 2 months. The 
following are the dimensions of the column stated in inches :— 
Experiment L. 
Height before 
deformation. 
Height after 
deformation. 
Diameter 
before defor¬ 
mation. 
Greatest di¬ 
ameter after 
deformation. 
Time of defor¬ 
mation. 
Crushing load after 
deformation. 
1-513 
1-127 
•813 
1-0205 
54 days 
Stronger than the ori¬ 
ginal rock 
The column was thus shortened by ‘386 of an inch, equivalent to 25'51 per cent. 
On cutting through the tube the deformed marble was found, as in former experi- 
