Summary
Thirty-two charges of wood from western juniper trees were steam distilled. The volatile oil was recovered, and its composition and yield determined.
The wood was reduced to various-size particles by chipping and by hammer-milling. Some charges contained bark; some were of wood only.
Low steam pressures (under 10 psi) and hammer-milled chips gave oil yields of higher quality and greater volume.
Oil recovery averaged around 1.4 percent, of which about 15-40 percent was cedrol.
Complete report... http://juniper.oregonstate.edu/kurth.htm
