Third Report of Experiments on the Quantities of Rain fall¬ 
ing at different Elevations above the Surface of the Ground 
at York, undertaken at the request of the Association by 
William Gray, Jim., and Professor Phillips, F.R.S. 
F.G.S., Secretaries of the Yorkshire Philosophical Society ; 
with Remarks on the Results of the Experiments , by Pro¬ 
fessor Phillips. 
At the conclusion of the second series of experiments, the 
square gauges, which had been employed for two years, were 
removed, and replaced by others of a different form, which were 
arranged in a different manner. Three gauges were placed at 
each station, and a duplicate set of the ground gauges was fixed 
in Mr. Phillips’s garden. Each gauge was cylindrical, 5 inches 
in diameter and 12 inches high ; one of them (C) was an open 
cylinder, the others (B and A) were furnished with a funnel 
decreasing to a hole of ^ inch, and a small lateral discharge- 
pipe £ inch in diameter, but 1 inch below the edge. This dis¬ 
charge-pipe was left constantly open. The object of this ar¬ 
rangement was to procure data as to the rate of evaporation at 
the different stations, both from the open vessel C and the 
gauges A and B. For this purpose a certain depth of water 
was poured into C, and its level, fluctuating with evaporation 
- and rain, was measured at the same time that the gauges A and B 
were examined. The difference in inches and tenths between 
the measure of the w r ater first introduced into C, augmented by 
the depth of rain in A,—and the depth of the residuary water 
in C,—gave the amount of evaporation in a given time. 
The difference between A and B was this : The gauge A was 
emptied frequently, sometimes immediately after rain, while B 
was left for longer periods. The difference of the measured 
rain in each gave of course the difference of the evaporation 
from them. This part of the experiments served only to prove 
that the amount of evaporation from either gauge w-as very 
small. From various causes, and principally from the extreme 
inconvenience attending the laborious ascent of the Minster and 
Museum, the experiments on evaporation were not persisted in 
after August. 
