Metcorological Obfervations. 597 
fion; but would, at the-fame tim@ much increafe 
the evaporation, by detaining a quantity of water 
inthe funnel, and’expofinga much greater furface 
tothe air. A better way of corre@ting this error, is, 
I think, to have'a perpendicular rim an/inch or 
two high, fixed to the rim of the funnel. The 
form of the gages which I have had’ conftru@ted 
for my own ufe, and that of my ftiends, is 
reprefented in the annexed Plate. (IX. fig. 2.) 
In gages of this form, efpecially when made 
fufficiently large, Mr. Copland, of Dumfries, in- 
forms me, that he found the lofs from difper- 
fion nearly, if not entirely, correéted. The area 
of one of his funnels contains 144 fquare 
inches, and the other 288. He has com- 
pared thefe with one of an area of fixteen 
inches, and always found a fmaller than pro- 
portional refult ftom this laft in windy weather. 
He fays, he has obferved his large fquare gages 
in ftormy falls, and could obferve nothing 
driven over after having ftruck the infide, and’ 
was furprized to fee fo little loft even during a hail 
fhower. He recommends gages with fquare aper- 
tures, in preference tothofeof acylindrical orconi- 
cal form ; for ‘* from the rotatory motion which 
the air always takes when forced over the end of a 
tranfverfely truncated cylinder, and which 
emits a whiftling noife, the rain will be carried 
aver the edge of the cylinder, and be almoft 
: entirely 
