THERMOMETERS IN VARIOUS MEDIA. 



167 



Table I. — Radiation Thermometers. Mean Monthly 

 Maximum in the Sun. 



JANUARY. 



Year. 



In 



vacuo. 



In car- 

 bonic- 

 acid gas. 



In 

 hydro- 

 gen gas. 



Con- 

 densed 

 air. 



Black- 

 bulb 

 freely 

 exposed. 



Maxi- 

 mum in 

 shade. 



1862. 

 1863. 

 1864. 

 1865. 





 48-0 



45' 1 

 44' 3 





 4 6 '3 



45-0 



44-1 





 46-4 



447 

 44-1 





 47-8 



45 "4 

 44-2 





 44-6 



43 '4 

 43" 6 





 43 " 2 



419 

 4i'3 



Means ... 



45-8 



45* 1 



45' 1 



45-8 



43-8 



42*1 



FEBRUARY. 



1862. 

 1863. 

 1864. 

 1865. 



54-8 

 650 



5o-5 

 5°"7 



53" 2 

 619 



49'3 

 5i-3 



53*° 

 62-4 



48-9 

 5ii 



54-2 

 62*1 



53' 6 

 50-8 



497 



55'2 



45'5 

 46-8 



4 6 '3 

 50-0 



42-0 

 42-3 





•55-2 



539 



53-8 



55'2 



49'3 



45-i 



MARCH. 



1862. 

 1863. 

 1864. 

 1865. 



64-4 



757 

 7<y6 



653 



613 

 73-6 

 69-6 

 64-9 



60-3 



72-1 

 68-3 

 65-9 



607 

 721 

 69-1 

 63*1 



56-8 

 62-8 



59"8 

 57-0 



48-9 

 52-6 



48-9 

 44- 1 





69*0 



67-3 



66-6 



66-2 



59-1 



48-6 



APRIL. 



1862. 

 1863. 

 1864. 

 1865. 



8r6 



86-o 

 85-8 

 92*6 



j6~i 



83-3 

 83-4 

 9 r 3 



73*6 

 812 

 819 

 89-4 



75'3 

 8i-8 



82-8 

 89'3 



70-8 

 699 

 76*0 

 815 



57*5 

 56-2 

 6o"o 



635 



Means 



86-5 



83-5 



8r 5 



82-3 



74-6 



593 



MAY. 



1862. 

 1863. 

 1864. 

 1865. 



957 

 88-4 



97'5 

 937 



89-1 

 871 



96-4 

 88-2 



86-9 

 86-i 



95*° 

 87-1 



86-3 

 866 

 95*8 

 87-9 



81-2 



74-8 

 81-4 

 79'3 



64-4 

 61 2 

 66-5 

 65*0 





93-8 



90-2 



888 



891 



79-2 



6 4"3 



