AUTOMATIC RECORD 



227 



The Automatic Recorder for Trees 



The record was obtained by the device illustrated in 

 fig- i33» for recording the diurnal movements of trees and 

 C 



Fig. 133. Automatic Recorder of movements of trees and plants. 



T, differential metallic thermometer ; r, recording lever for 

 temperature ; r', for recording plant-movement ; c, clock- 

 work for oscillation of recording plate. The same clock- 

 work moves plate laterally for 24 hours. 



other plants. One of the two writing levers gives the 

 record of variation of temperature by the Thermograph, 

 and the other lever records the up or down movement 

 of the tree throughout 24 hours. As the extent of the 



