246 Dr Richardson's Observations on Solar Radiation, 



TABLE I. 



Of Mean daily Maximum excess for each month of the Radiation 

 Thermometer over the Temperature in the Shade; and of the 

 Maximum excess for each month. 



Note. — In October, November, December 1825, and January 1826, the obser- 

 vations were recorded only when the sun shone out favourably ; in the fol- 

 lowing months, up to May inclusive, almost regularly at the stated hours. 

 In July and August 1826, they were made at intervals of three hours ; and 

 from September 1826 to May 1827, six, and latterly seven, daily observa- 

 tions were made throughout each month. 



The maximum excess of the radiation thermometer in the first sixteen 

 days of May 1827 was 50°.2, and the mean of the maxima for the same time 

 was 33°.85. 



