When using this improved form Abderhalden vacuum drying apparatus, the material to be dried is placed in the inner tube

When the liquid in the distilling flask boils, the vapors pass through the drying chamber and heat the inner tube at a constant temperature. The vapors then ascend to the reflux condenser, condense, and flow back through the return tube into the boiling flask. The boiling flask is 250mL capacity, with [ST] 24/40 joint. Desiccant flask has an interchangeable stopcock and [ST] 40/35 joint. Fabricated from borosilicate glass.