412 THE TIMBERS OF THE WORLD 



Ha\dng in view the wide variations in the quality of timber, it is not 

 possible, of course, to make for any particular kind a formula which would 

 prove infallible. The charts are but guides, and although they represent 

 the treatment for average timber of the kind, de\aations are necessary 

 to meet special cases. The recording hygrometer serves a double purpose, 

 as \\dth the chart it shows the course to be followed, and the record 

 of the pens show whether the proper attention has been given, and steam 

 maintained, while in cases of deviation from the standard chart, a record 

 remains for future guidance. 



