196 



GREENHOUSE AND WINDOW-GARDEN WORK 



Effects of wind in cooling glass (Leuchars) 



Time Required to lower Temperature 

 from 120 to 100 F. 



Velocity of Wind 

 per hour 



3.26 miles . 2 : 58 minutes 



5.18 mrles 2 16 minutes 



6.54 miles 91 minutes 



8.86 miles 66 minutes 



10.90 miles 50 minutes 



13.36 miles 25 minutes 



17.97 miles 08 minutes 



20.45 miles 00 minutes 



24.54 miles 91 minutes 



27.27 miles 81 minutes 



Table of radiation for glass (Dean 



STEAM 



HOT WATER 



Table of amount of steam radiating sur- 

 face necessary to heat a given amount 

 of glass exposure to various tempera- 

 tures in zero weather. 



Table of amount of hot-water radiating surface 

 necessary to heat a given amount of glass 

 exposure to various temperatures in zero 

 weather. 



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



