PROFESSOR 0. REYNOLDS AND MR W, H. MOORBY 
36 (; 
bearings of the brake. Entering the vertical stand pipe, E, the water flowed round 
the bulb of the initial temperature thermometer, a small stream being diverted to 
waste through the jacket. The straight flexible rubber pipe, F, then led the stream 
to the brake, G, from which the water flowed through the automatic valve, H, and 
the bent rubber pipe, K, to the vertical stand pipe, L, carrying the thermometer for 
measuring the temperature of discharge. Then passing through the condenser, M, 
and the rising pipe, N, the two-way switch, P, directed the water either to waste or 
into the tank, P, standing on the platform of the weighing machine, S. At T is 
essel fbimin^ the artificial atmosphere. A small Bourdon gauge was 
fitted on to the top of the brake because the mercury gauge, indicating the pressure 
in the air-vessel, was not visible to the observer when taking readings of the ther¬ 
mometers, and it was important that this pressure should be kept constant. 
The Hand Brahe and Speed Indicator. —(Part I., par, 30.) 
16. In addition to the separate parts of the apparatus already mentioned there 
was a hand brake by which a moment of about 50 ft.-lbs. could be gradually 
applied to the engine shaft, and by this means a delicate adjustment of the speed of 
revolution was obtained. 
To make this speed evident a small speed gauge was driven by a gut band from 
the engine shaft. It consisted of a paddle rotating about a vertical spindle in a 
cylindrical case. The case contained coloured water, and the pressure generated 
forced a column of the water up a glass tube, to a height which varied with the 
speed of revolution. 
In Part I„ Professor Reynolds has referred in one or two instances to the 
excellent manner in which various parts of the apparatus were constructed by 
Mr. Foster, to whom my thanks are also due for the valuable assistance he often 
rendered at critical moments in the research, and further for the advice and help he 
was always willing to give in the construction of apparatus for which I was mainly 
responsible. 
The Method of conducting the Experiments finally adopted—using the Completed 
Apparatus. 
17. During the progress of the experiments, I had at my disposal the services of 
two men and a boy. Of the men, the first, Mr. J. Hall, was fully engaged in attend- 
ing generally to the needs of the engine and boiler, and had besides to maintain the 
boiler pressure at a point which ensured the steady running of the engine. I am 
bound to state that very much of the success met with must be attributed to the very 
admirable manner in which iVlr. Halls part of the work was performed. 
