EXPEDITION TO POINT BARKONY, ALASKA. 



:35 



Statement shoiviny the solar radiation at TJylaamie from February, 1883, to August, 188.3 Continued. 



TERRESTRIAL RADIATION. 



A minimum thermometer was exposed for terrestrial radiation from November 16, 1882, to the 

 closing of the station, and read every day at Washington midnight. It was laid upon a board 

 securely fixed upon the surface of the ground, and a box was provided with which it could be 

 covered during snow .storms, to prevent injury to the thermometer in digging it out of a snow- 

 drift. Snow storms or drift of snow of course prevented observations with this thermometer. 



On January 14, 1883, the Yale special minimum thermometer, No. 7 (carbon disulphide), was 

 exposed beside this in its case, but was destroyed on January 25th by the Eskimo dogs, which 

 gnawed oft' the end containing the bulb, attracted probably by the varnish on the case. 



