TABLES 151-153. 



VISCOSITY. 



TABLE 151. - Solution of Alcohol in Water.* 

 Coefficients of viscosity, in C. G. S. units, for solution of alcohol in water. 



The following tables (152-153) contain the results of a number of experiments in the viscosity of mineral oils derived 

 from petroleum residues and used for lubricating purposes.t 



TABLE 152. -Mineral Oils. 



TABLE 153. Mineral Oils. 



* This table was calculated from the table of fluidities given by Noack (Wied. Ann. vol. 27, p. 217), and shows a 

 maximum for a solution containing about 40 per cent of alcohol. A similar result was obtained for solutions of acetic 

 acid. 



t Table 152 is from a paper by Engler in Dingler's " Poly. Jour." vol. 268, p. 76, and Table 153 is from a paper by 

 Lamansky in the same journal, vol. 248, p. 29. The very mixed composition of these oils renders the viscosity a very 

 uncertain quantity, neither the density nor the flashing point being a good guide to viscosity. 



t The differenj groups in this table are from different residues. 



SMITHSONIAN TABLES. 



137 



