598 Meteorological Obfervatious. 
entirely prevented from falling into the gage.” 
He foon found, he fays, after ufing fquare 
gages, that the refults from them were much 
more ample than from fome others that were 
kept in the neighbearhegd, which were of a 
cylindrical form. 
A little cup, with its mouth Meret is 
fitted to the neck of the funnel as at 4, which 
will go over the mouth of the bottle; becaufe 
it is evident, that when rain is driven againft 
the outfide of the funnel, or in confequence of 
the condenfation of dew upon the outer or under 
fide of it, more water would be collected by 
the receiver than falls within the area of the 
funnel, if it was not prevented by a contrivance 
of this kind. : 
In order to determine the perpendicular 
height of water which falls upon the ground 
by means of a rain gage :—If we know the weight 
of water caught in the bottle, the area of the 
aperture of the funnel, and the weight of the 
cubic foot of water, we can eafily calculate the 
perpendicular height. Mr. Dalton, in his 
Meteorological Effays, (page 34) has given a 
theorem for this purpofe: but upon comparing 
tables which I had conftru@ed for my own ufe 
by this theorem, with fome which were fent me 
by Mr. Kirwan, I found that the height given 
in mine much exceeded that in the tables of this 
laft 
