July 10. 1919 



HARDWOOD RECORD 



21 



160 



to ■ ^C 



iO 40 30 — — 

 ^oleture Content In Par Cgnt of Dr.y Weight 



period of several days than it is to make small progressive uliauges 

 from day to day, since fewer adjustments of valves and thermostats 

 are necessary. For this reason only six changes are provided in 

 each schedule. Temperature is changed in 5-degree steps, while 

 changes in humidity vary from 5 per cent at first to 15 per cent at 



the end of the run. Both conditions are changed on the same day, 

 first when the wood reaches a moisture content of 40 per cent, next 

 at a moisture content of 30 per cent, and from then on at the time 

 of each additional drop of 5 per cent in moisture content, until 10 

 per cent is reached. (To be continued July 25) 



