94 



C. Barus — Isothen?ials, Isopiestics and 



tained by dropping the initial curve oyer stated amounts. For 

 any viscosity and at any temperature within the range of 

 observation, therefore, the increment of pressure which will 

 just annul the decrement of viscosity due to a rise of tempera- 

 ture of one degree Centigrade is, for instance, 



t^ 



\ 



4 



\ \ 



\ 



i# 









10 



14. 



, 

















la 



• 





\ \ 



/ 









-Tl-lO 9 



n 



• 















f/ 



u 



j 

















10 

 9 















___^ 



/.-rj-SXlO 9 



' 1/ 















___-T]=5Xl0 9 



8 







/^"\ 



\ 



--Ay? 







-7]=7Xl0 9 



7 







\^^^ 



V 









^_-7]=llX10 9 



6 

 5 

 4s 

 3 



> / 





K2- 















^ 



<>\ 







^ 





_J0L 













X 



\ 





\ ^ir—-^' ' 



it 

















A^^^^- 



1 

 C 





X 



\ \ « 













i 



z. 



5 4 l 





6 7 



6 



9 ll 



) ii li iS 



Fig. 3. 



Fig. 3. — Chart showing the isothermals (0), the isopiestics (p), and the iso- 

 metrics (77), relative to the viscosity of marine glue. 



Abscissas : Pressure in hundreds of atmospheres, or in two hundreds of atmo- 

 spheres of pressure excess. 



Temperatures in degrees Centigrade beginning with 10° C. 



Ordinates : Viscosities in billions of absolute (g/cs) units. 



Temperatures in degrees Centigrade beginning with 10° C. 



