384 
PROFESSOR 0. REYNOLDS AND MR. W. H. MOORBT 
thermometer was hung alongside the brass scale tube of the barometer, and its 
reading was assumed to be the temperature of the barometer. Allowance having 
been made for this temperature, the steam escape cock was adjusted till the pressure 
inside the apparatus, as measured in the barometer, was at the required level. A 
reading was then taken of the thermometer under examination. The stem was 
Fig. 8. 
Fig. 9. 
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pushed as far as possible into the boiler, the reading standing about a quarter inch 
above the top of the cork. Since there was always some escape of steam which blew 
up the hole in which the thermometer was inserted, it was not thought necessary to 
attempt to make any correction for the exposed part of the stem. 
The annexed table gives the readings taken from this thermometer when immersed 
in steam of various known temperatures and the dates on which the tests were made :_ 
