196 



(jREKyilOL SE Ayn \\ ISDOW-GARDEy WORK 



Effects of wind in cooling glass (Leuchars) 



Velocity of Wind 

 per hour 



li.JG miles 



5. IS miles 



6.54 miles 



8.86 miles 



10.90 miles 



13.36 miles 



17.»7 miles 



20.45 miles 



24.54 miles 



27.27 miles 



Time Required to lower Temperature 

 from 120° to 100° F. 



2 : 58 minutes 

 2 : 16 minutes 

 1:91 minutes 

 1 : 06 minutes 

 1 : 50 minutes 

 1 : 25 minutes 

 1 : 08 minutes 

 1 : 00 minutes 



: 91 minutes 



: 81 minutes 



Table of radiation for glass (Dean 



From Dean's " Greenhouse Heating." by permission of " Domestic Engineering.' 



