82 



Reuben T. Patton : 



of the material. In the case of Fig. 8 the heaviest specimen was 64:5 

 gms., and the lightest 64:12 gms., so that the differences in the 

 weight of the specimens were negligible. 



Oak 30"C 



30 

























. 





# 



V 

























it 



\, 



^^^ 



^ 



---^ 



:::^-j^ 

















t 



\- 





— - 





^ 



::^ 



^ 













1 







^^ 



\, 



X 



N, 



^^ 



\ 











t 









X 



\, 



N 



^\ 



^\ 





















' 



\ 







\ 





"^ 



0^ 



\\n 











I 









\ 



\ 





v 





\« 









A 









-■-\ 



\ 



^ 



\ 





\ 









/ 



\ 











\ 



.\ 





\'" 



by 





10 



A 















\ 



\V 



\^- 



Hi 







n 



v 









V 



\ 





\v 



\\m 



ajS 









V 









\ 



\^ 



■^ 



V 



\ "' 



l«p. 









\ 









V. 



^ 





\ 



A,. 



y» 

















^ 





\ 





^4<* 



■ys 

































^oJ 









4> 



1 



i 



O d 



O 4 



o t 



6 6 



7 



e 



d 9 



K 



« 





Percentage of Humidity. 



Fig. 8. 



Typical Series of Losses in Weight of Blocks, Drying at 

 Various Humidities. 



Since in all the experiments, except that at 20 °C, the graphs bent 

 4ownwards between the 7 per cent, and the 2 per cent, humidities, 

 there does appear to be a limiting humidity below which drying is 

 retarded. Low humidities rarely occur in nature, though it is be- 

 lieved as low a humidity as 4 per cent, has been experienced in this 

 State. As far as air drying in this State is concerned, therefore, we 

 may say that drying would never be retarded. It has already been 

 remarked that the curve of loss is a composite curve, and is made up 

 of two types of curves. The first part of the curve of loss gives the 

 losses when the wood is actively drying. These losses will now be 





