i recall they were using methal alchohol to help extract the oil , should be there somewhere in the literature...
I think the rig is a solvent extraction unit: a thermocouple in the lid of the pressure cooker is connected to a dial thermometer to regulate heat provided by flame below, the can hanging above with a valve on each end of the connection is filled with resin+solvent, the ball float-valve inside the cooker regulates the flow of resin+solvent, the rigid tubing is connected to a vaccuum pump likely... eh?
Great Thread, great picts El Rubio !!!!!!!!