Meteorology of Whitehaven. 

 Hygrometers* 



375 



Radiation to the Sky, ^c.f 



* These observations were made twice daily, viz. at 10'' 30™ a.m. and 3'' p.m. In 

 deducing the dew-point from the wet and dry bulb thermometer, Mr Oluisher's va- 

 luable hygrometrical tables liave been used. The dew-point apparatus, and wet and 

 dry bulb thermometers, have both been compared with Mr Oluisher's standard. 



t In 1846, the naked thermometers were placed on a flat piece of cork, in cloudy 

 and wet weather, but on clear nights they were exposed in wicker baskets, contain- 

 ing a layer of raw wool. In 1847 the cork only was used. 



