Trans. Roy. Soc. Edin. 



Dr. Crichton Mitchell on the Convection of Heat by Air Currents. 



Vol. XL. 



Fig. 5. 



'. ■ ■ ■ • • - • ~~ 



Fi S 4 Fid 3. 



i^X 



V£ 



\\D 



o 

 o 

 U 

 u. 

 O 



w 



200 



4-00 600 



Speed of Air Current (metres per minute). 



800 



IOOO 



