Prof. TyndalPs Contributions to Molecular Physics, 521 



Table XXX. — Radiation through dry Carbonic Acid. 

 Source, carbonic-oxide name. 



Tension in inches. 



Deflection. 



Absorption. 



10 



33'7 



53-0 



2-0 



37-0 



61-7 



3-0 



38-6 



66-9 



4-0 



39-4 



70-0 



5-0 



40-0 



72-3 



10-0 



41-4 



78-7 



About four months subsequent to the performance of these 

 experiments they were repeated, using as a source a much smaller 

 flame of carbonic oxide. The absorptions were found somewhat 

 less, but still very high. They follow in the next Table. 



Table XXXI. — Radiation through dry Carbonic Acid. Source, 

 small carbonic-oxide flame. 



Tension in inches. 



Deflection, 



Absorption 



1-0 



o 



17-3 



48-0 



20 



20-0 



55*5 



30 



21*7 



60-3 



4-0 



22-8 



65-1 



50 



24-0 



68-6 



10-0 



260 



74-3 



For i;he rays emanating from the heated solids employed in 

 all my former researches, carbonic acid proved to be one of the 

 most feeble absorbers ; but here, when the waves sent into it 

 emanate from molecules of its own substance, its absorbent 

 energy is enormous. The thirtieth of an atmosphere of the gas 

 cuts off half the entire radiation ; while at a tension of 4 inches, 

 nearly 70 per cent, of the whole radiation is intercepted. 



The energy of olefiant gas, both as an absorbent and a radiant, 

 is well known ; for the solid sources of heat just referred to, its 

 power is incomparably greater than that of earbonic acid ; but, 

 for the radiation from the carbonic-oxide flame, the power of 

 olefiant gas is feeble when compared with that of carbonic acid. 

 This is proved by the experiments recorded in the following 

 Table. 



Table XXXII. — Radiation through dry Olefiant Gas. Source, 

 carbonic-oxide flame. 

 Tension in inches. Deflection. Absorption. 



1 17-0 24-2 



2 260 37-1 

 4 33-0 49-1 

 Total heat . 47*3 100*0 



Phil Mag, S. 4. No. 192, SuppL Vol. 28. 2 M 



