PROFESSOR IlELE-SHAW AND MR. ALFRED HAY 
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four corners of the slide. The pressure in the well, when low, is found by means of 
the barometer tube 11 ; when high, by the pressure gauge G. 
Fig. 1. 
Apparatus for Determining the Viscosity of a Fluid by the method of a Thin Film. 
The liquid is caught in the box K from which it passes through the spout L, into 
the vessel M, where it is collected. When viscous, the liquid was allowed to flow for 
a fixed time into M, and then weighed ; when more mobile, it was collected into a 
larger vessel of known capacity, and the time observed which it took to till the vessel 
up to a notch accurately made for the purpose. 
The following tables give the results of the measurements :—• 
O O 
