168 



>IR. G. V. VERNON ON BLACK- BULB 



Table I. — Radiation Thermometers. Mean Monthly 

 Maximum in the Sun (continued) . 



JUNE. 



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. 





 88-9 



97-2 



98-9 



ior8 





 86-3 

 96-6 



97*5 

 104-6 





 84-2 



93*° 



94 9 

 99-0 





 84-8 

 94-1 



95'5 

 ioi - o 





 696 

 81-4 

 812 



93'° 





 58.8 

 66-8 

 66*2 

 72-8 



Means , , . , 



967 



962 92*8 



93-8 



81-3 661 



JULY. 



1862. 

 1863. 

 1864. 

 1865. 



97-8 



IOII 



ioo"8 

 1106 



940 



1007 

 108-6 



I07 - 2 



919 

 981 

 98-8 



103-4 



918 



987 



98-8 



103-8 



80-3 



87-3 

 86-o 



94'4 



66-7 

 70-8 

 70-9 

 76-6 



Means 



I02"6 



102*6 



981 



983 



87-0 



71-2 



AUGUST. 



1862. 

 1863. 

 1864. 

 1865. 



93*9 



96-3 



102*6 



935 

 94'5 

 97-0 



918 

 910 

 94-8 



92-7 

 92-1 

 97-0 



83-4 

 80-9 

 817 



68-7 

 68-o 

 68-7 



Means , 



97-6 



95-0 



92-5 



93'9 



82-0 



68-4 



SEPTEMBER. 



1861. 

 1862. 

 1863. 

 1864. 



86-5 

 83-6 

 79-2 

 917 



80-9 

 8r6 



78-5 

 88-4 



78-5 

 8o-o 

 75-2 

 84-6 



79-6 



8o-o 



787 

 90T 



78-5 



74-2 

 70- 1 

 73-3 



639 

 62-6 

 58-5 

 65-2 



Means 



85-2 



82-3 



79-6 



821 



74-0 



62-6 



OCTOBER. 



1861. 

 1862. 

 1863. 

 1864. 



72 - 6 



7 I- 3 

 66-o 



693 



697 

 680 

 662 

 669 



689 

 66-6 

 646 

 649 



709 



672 

 67-5 

 68-6 



64-8 

 619 

 62-0 

 617 



6o-6 

 56-5 



559 



57*o 



Means 



698 



677 



662 



68-6 



62-6 



57'5 



