No. 5547S. 



Psychrometers, Rain Gauges. 



657 



HejRimnur 



Pref Helliut" 



~3 



55 473. 1 : 8. 



55 474. 1 : 20. 



55 475. 1 : 7. 



56.473. Rain Gauge after Prof. Hellmann, for catchment area of 100 sq. cm; the measuring j s. d. 

 glass gives the rainfall in millimetres 



55.474. Recording Rain Gauge, Figure, working very reliably, 8-day mechanism, on iron 

 base, with reservoir and test vessel . . . 



55,475. Recording Rain Gauge, Figure 



The catchment vessel is separate from the recording mechanism, in order to be able to set up 

 the latter in the observing room and the former in the open air. 



0. 9.0 



27. 10. 

 12. 10. 



Cl. 2001,4612, 3430. 

 4952, 2003. 



