WORK OF M. R. SCHMIDT. 



139 



In table 104 77 is calculated by the following methods: 



v f a 0-00891X4465X1.1546 ftft1 - QR 11K>lfl , . +u 



tor viscosimeter;!, 77 = ^r^~ " = 0.61735, l.lo46 being the den- 



1 X Z4.4: 



sity of 75 per cent glycerol and methyl alcohol. 



Table 104. Viscosity Determinations. 



For viscosimeter 1, the viscosities of 50 per cent glycerol and water and 50 per 

 cent glycerol and methyl alcohol were determined in A; then, from the times of 

 flow of these solutions through l,two values were obtained which were used to deter- 

 mine viscosities in 1, and the mean value of 77 for 75 per cent glycerol and methyl 

 alcohol is determined from them, using T = 445.6. The same process is employed 

 for viscosimeter 2. It is seen that 77 determined by direct comparison with water is 

 greater, as it should be, than 77 determined by using liquids of intermediate viscos- 

 ities in several instruments. 



LITHIUM BROMIDE. 



The lithium bromide gave a flame test which showed no appreciable impurity. 

 It was dried to constant weight at 150, and was again dried after each exposure to 

 the air. Table 105 gives the molecular conductivities of lithium bromide in pure 

 glycerol at 25, 35, and 45. It will be noticed that while the values of /x are very 

 small, yet they show a regular increase with dilution, as is the case with all liquids 

 having a marked dissociating power. 



Table 105. Conductivity of Lithium Bromide in Glycerol at 25, 35, and 45. 



Table 106 shows the conductivities of lithium bromide in various mixtures of 

 glycerol with water, methyl alcohol, and ethyl alcohol. The results are plotted 

 in figs. 60, 61, and 62. The curves show that the conductivities in the mixtures 

 depart widely from the law of averages, there being a marked sagging of the curves in 

 each case. The results are much like those obtained by Jones and Carroll with 

 cadmium iodide in mixtures of water and methyl alcohol. No minimum is observed, 

 nor, indeed, has any minimum appeared in all the work with glycerol solutions. 

 This is not surprising. It is hardly probable that any mixture of glycerol with the 

 less viscous solvents would have a viscosity greater than that of pure glycerol. It 



