THERMOMETERS IN VARIOUS MEDIA. 



169 



Table I. — Radiation Thermometers. Mean Monthly 

 Maximum in the Sun {continued) . 



NOVEMBER. 



Year. 



In 



vacuo. 



In car- 

 bonic- 

 acid gas. 



In 

 hydro- 

 gen gas. 



Con- 

 densed 

 air. 



Black- 

 bulb 

 freely 

 exposed. 



Maxi- 

 mum in 

 shade. 



1861. 

 1862. 

 1863. 

 1864. 







5 I# 4 



467 



53 -6 

 53*° 







47-0 



53'4 

 52-6 





 496 

 468 

 52-8 

 5 2 '9 





 51-6 



46-4 

 54*4 

 5*-5 







47-2 



44"9 

 52-3 

 49- 1 





 46-3 

 437 

 507 

 48-2 





51-2 



5°'9 



5°-5 



5ia 



48-4 



47-2 



DECEMBER. 



1861. 



1862. 



1863. 



. 1864. 



47-2 

 496 



49'° 

 43 '* 



45"3 



49'5 

 492 



43'5 



45-3 



499 

 48-9 



43'5 



48-0 

 496 

 49-6 

 43 '4 



44-0 

 48-2 

 48-6 

 41-9 



44-8 

 48-0 

 48-3 



43" 2 



Means 



47-2 



469 



469 



477 



457 



46*1 



Table II. — Mean Results of the Four Years. 



Month. 



In 



vacuo. 



In car- 

 bonic- 

 acid gas. 



In 

 hydro- 

 gen gas. 



In con- 

 densed 

 air. 



Black- 

 bulb 

 freely 

 exposed. 



Maxi- 

 mum in 

 shade. 



February . . . 



March 



April 





 45-8 



55** 



690 

 86-5 



93-8 

 967 



I02"6 



97 -6 

 85-2 

 698 

 51-2 



47-2 







45'i 



53*9 

 67-3 



83-5 



90*2 



962 



1026 



95-0 

 82-3 



677 



5°"9 

 46-9 





 45'i 

 53-8 

 66-6 



81-5 

 88-8 

 928 

 98-1 

 92-5 

 796 

 66-2 



5°'5 

 46-9 





 45-8 

 55-2 

 662 

 82-3 

 89-1 

 938 

 98-3 



939 

 82-1 

 68-6 

 512 



477 





 438 



49'3 



591 



74-6 



79-2 

 813 



87-0 

 820 

 74-0 

 626 

 48-4 

 457 





 42*1 



45' 1 

 486 



59'3 



6 4'3 

 661 



7I - 2 



684 

 626 



57'5 

 47-2 

 46-1 



May 



June 



July 



September . . . 



November ... 

 December ... 



Ann. means... 



75"° 73"4 



71-9 



729 



656 



566 



