e| 594 | cole Meteorological Obfervations. 
_A raw OBSERVATIONS ox 
|_| RAIN GAGES. 
——— 
 wehnn Chicks: it muft be shtewwels hae 
imperfect inftruments, and that on two accounts : 
____Firft, from the evaporation which very commonly 
takes place on the interior furface of the funnel . 
during | wet weather in fummer; for the air is, 
for the moft part, in a condition to abforb more 
water than it contains, though (as Mr. Gough 
obferves in aletter which I received from him) 
_ our humid atmofphere is fometimes fo 'per- 
-fedtly faturated, as to depofit a part of its vapour 
‘on furniture within doors, even during the 
| — “months of July and Auguft, provided the wea- 
“ther: be very wet; but water will frequently 
evaporate from the furfaces of many bodies, 
~ Particularly metallic fubftances, while rain is 
falling i in fummer, or dew is forming in an 
.. evening: for if a veffel of tinned iron:be rubbed 
_ with a wet fponge, and then fufpended with its 
_- mouth downwards, its inner furface will foon 
| become dry, though rain be falling, or dew 
forming at the time. 
Itiis certainly neceffary to bfcbithidi if pof- 
fible, the quantity of water loft by evaporation ; 
for 
