90 Prof. Magnus on the Propagation of Heat in Gases. 

 Transmission of Heat by a Glass surface at 100° C. 



Position of 

 equilibrium ., 

 of the Mean - 

 needle. 



Observed 

 deflection. 



Difference 



Position of 



equilibrium 



of the 



needle. 



Mean. 



Observed 

 deflection. 



Difference. 



Atmospheric air under 1 atm. pressure. 



Atmos. air under 22-5 millims. presssure. 



-i 







+0-5 



0-5 



0-5 



-0-5 



+0-2 

 +0-5 

 +0-5 



140 

 14-5 



150 

 150 



14-5 

 14-3 

 14-5 

 14-5 



+0-5 

 0-5 

 0-7 

 0-7 

 07 



+0-5 

 06 

 07 

 07 



160 

 160 

 16-2 

 162 



15-5 

 154 

 15-5 

 15-5 



Mean 145 



Mean 15-5 



Atmospheric air under 1 atm. pressure 



Atmospheric air under 18-0 millims. pres. 



+3-5 

 1-5 

 20 

 20 

 20 

 2-0 



+2-5 

 1-7 



20 

 2-0 

 20 



17-0 

 16-0 

 16-2 

 16 5 

 16-5 



14 5 

 14-3 

 14-2 

 14-5 

 14 5 



-0-5 

 +0-2 

 + 12 

 +1-0 

 + 10 

 + 10 



-015 



+07 



11 



10 



10 



147 

 157 

 162 

 16-2 

 162 



14-85 



150 



151 



152 



152 



ft 





Mean 15-1 







Atmospheric air under 1 atm. pressure. 



Atmospheric air under 8 millims. pres. 



-00 



+0-5 

 +0-5 

 +0-5 

 +0-5 



+0-25 

 0-5 

 0-5 

 05 



147 



150 

 150 

 150 



14-5 

 14-5 

 14-5 

 14-5 



00 



+0-2 

 +05 



+07 



+0-7 



+0-1 

 035 

 06 

 07 



160 

 160 

 16-5 

 165 



15-9 

 1565 

 15-9 

 15 8 



IV 





Mean 15-8 









Atmospheric air under 9 millims. pres. 



00 



00 



-0-2 



-0-2 



-02 



00 

 -01 

 -0-2 

 -0-2 



157 

 157 

 157 

 155 



15-7 

 15-8 

 15-9 

 157 



Mean 158 



Atmospheric air under 1 atm. pressure. 



Hydrogen under I atm. pressure. 



+0-5 



+!:? 



1-2 

 17 

 1-2 



+0-7 



+ 1-1 



1-2 



1-5 



IS 



15-2 

 155 



15-7 

 160 

 160 



14-5 

 14-4 

 14-5 

 14-5 

 14-5 



+1-5 



+ 10 

 1-2 

 1-2 

 07 

 05 



+ 1-2 

 11 

 12 

 10 



06 



150 

 150 

 150 

 150 



147 



13-8 

 13-9 

 13-8 

 140 

 141 



Mean 14-5 



Mean 13-9 



