192 



SYMPOSIUM ON AERONAUTICS. 



portant that these stations and their buildings be easily accessible 

 to aircraft. A knowledge of the prevailing meteorological condi- 

 tions is therefore of prime importance in the location of any station 

 and in the orientation of its buildings. Among the climatic condi- 



FiG. 4. Mean of Wind Observations in " Highs " at 526 Meters above Sea 



Level, 1907-1912. 



tions that need consideration in this connection are cloudiness, rain, 

 (including thunderstorm frequency), fog, humidity, temperature, 

 pressure and wind. Of all these wind is the most important. It is 

 an advantage to a station if the wind has a decidedly prevailing 

 direction. Buildings housing aircraft can then be so oriented as to 

 be easily accessible most of the time. 



The Weather Bureau records can supply such information as 

 that shown in Figs, i and 2 for many other stations than are here 



