THE VISCOSITY OF WATER. 55 
bridge; Professor Lyle, Melbourne University ; Professor 
Pollock, Sydney University; and Mr. G. H. Knibbs, F.R.a.s., 
Federal Statistician, formerly Director of Technical Edu- 
cation, N.S.W., and Lecturer in Surveying, University of 
Sydney, for valuable assistance during the progress of 
this research, which was commenced at the Cavendish 
Laboratory, Cambridge, and completed at the Sydney 
' University. 
Note on the Viscosity of Solutions.—The viscosity of 
certain lithium chloride solutions was determined with the 
glischrometer described in the previous paper. The only 
novel feature of the measurements was the automatic 
recording of the time of flow. The inner platinum wires 
at band ec (Fig. 1, Plate 4) were connected by insulated 
wires, also the inner wires at a and d. Wires were fastened 
to the outer wires at a, b, c and d, and were connected to 
four plugs on a double reversing key. The two remaining 
plugs were joined by wires through a battery, and one of 
the electro-magnets already described. With the key in 
one position, there was electrical communication between 
the battery and electro-magnet and the outer ¢ on the one 
side, and the outer b on the other side. The circuit was 
complete only when the solution filled the spaces at both e 
and b. With the key reversed, the battery was connected 
to the outer d and the outeraand the circuit was complete 
when the solution filled the spaces ata andd. By regu- 
lating the amount of solution in the glischrometer, the 
signals could be made as short as necessary, at the begin- 
ning and end of the flow from R to L, or in the opposite 
direction, and the time of flow could be read off accurately 
on the tape. 
The following set of readings will be sufficient to illus- 
trate the accuracy with which determinations of the 
viscosity of solutions can be made with this arrangement: 
