ADIABATIC CHANGES OF MOIST AIR NEUHOFF 485 



grams and it attains the ridge of the mountain range at 3000 meters 

 altitude with the temperature — 7°.5 and the quantity of saturation 

 3 grams. 



If now the precipitation all falls away so that at the summit of 

 the ridge the total quantity of moisture or mixing ratio is equal 

 to the quantity of vapor or 3 grams, and if now in consequence of 

 the sinking, adiabatic compression takes place, then the air follows 

 the adiabat of the dry stage in its descent and attains the tempera- 

 ture of 2 2 . 5 when it reaches its initial level. At this point the 

 saturation curve is 17 grams hence the relative humidity is only 

 12 per cent. 



These and similar questions which hitherto have been solved 

 only to a very limited extent and by a crude approximate compu- 

 tation with the assistance of the small table published by Hann 23 

 can now be quickly answered by the use of this diagram. In this 

 way the graphic presentation allows of the solution of problems 

 that can be solved numerically only by very tedious interpolations. 



23 Hann : Die Gesetze der Temperaturanderung in aufsteigenden Luf t- 

 stromen, usw. Met. Zeit., 1874, p. 328. 



