324 
PROFESSOR 0. REYNOLDS AND MR. W. H. MOORBT 
PrcUminary Experiments at 212 ° Under Pressure. 
22. The preliminary investigations and the construction of the appliances so far 
described, were not conpdeted till May, 18.95. It then became possible to make some 
experiments as to the working of the brake under pressure and at high temperature, 
so as to obtain guidance as to the artificial atmosphere and means of controlling the 
leakages at the bearings. From these experiments two things came out clearlj^ 
It was found that all that was necessary for an artificial atmosphere was to connect 
the outlet of the air passage on the top of the brake by means of a flexible india- 
ruliber pipe capable of bearing the pressure to a vessel of very moderate capacitv. 
The Artificial Atmosphere. 
23. A tin can, holding about 3 gallons, with the bottom and top coned U 23 wards, 
and strong enough to stand the full pressure of 60 pounds, was adopted. The air 
connection with the can w"as at the top, at which there were also two side openings, 
one with a cock, to admit of air being pumped into the can, and the other with a fine 
Fig. 8. 
screw stop lor allowing a slow and definite escape of toir. An opening at the bottom, 
with a cock for drawing off water, was also provided. For forcing the air in, a syringe 
for inflating bicycle tyres was used in the first instance and proved ample; in fiict, 
when once the pressure was raised, the small amount of air released from the water 
