34 R. HOSKING. 
which time he has been on the roll.of Vice-Presidents. In 
Mr. Lenehan the Society has lost one of its most active 
members. He was always to the fore when any work was 
to be done or movement to be supported by personal energy 
or otherwise. 
THE VISCOSITY OF WATER. 
By RIcHARD HOSsKING, B.A. (Camb.) 
[Communicated by Prof. PoLLock, p.sc. | 
[With Plates IV.-IX.] 
[Read before the Royal Society of N. 8S. Wales, June 3, 1908.] 
IN my previous experiments on the determination of vis- 
cosity by the efflux method,’ I have always arranged to 
have the rate of flow of liquid in the capillary tube very 
small. The kinetic energy correction in the well known 
reduction formula was thus always small in comparison 
with the first term. Inthe present experiments, however, 
I have purposely increased this rate of flow in order to test 
the formula in cases where the kinetic energy correction 
is much greater. The glischrometer used in these experi- 
ments was of the same form as those previously used by 
me, but the bulbs were larger. It is shown in Plate 4, 
fig. 1. At a, b, c, and d, platinum wires are inserted, 
which are almost touching inside the tubes. The capillary 
C is fitted to the limbs by rubber bands. The volume of 
the bulb R at 0° O. is 10°2801 ccs., and that of Lat the 
same temperature 10°3201 ccs. Four capillaries were 
carefully selected for separate use in the glischrometer, 
and their ends were ground with fine emery, in a lathe. 
Their lengths, measured directly with callipers, were 5°570, 
1 Phil. Mag., March 1900, May 19U2, May 1904. 
