screw to swirl the output stream or the like which among other things keeps the output stream swirling in a state of turbulence to turn now to fig1 it is a pictorial view comparable to fig1 except showing an alternate embodiment 20 u2032 of the vacuum drying treatment apparatus in accordance with the invention additionally this alternate vacuum drying chamber 25 u2032 is mounted elevated on scaffolding the hood and base thereof hidden from view being wrapped inside a casing of insulation to reduce the heat loss to the room the air lock gate 48 is fed an input stream of material not in view from an overhead supply pipe which is encased inside an annular water jacket the water jacket is circulated with hot water to pre heat the infeed material before being introduced by the air lock gate 48 into the vacuum drying chamber 25 u2032 in like fashion the air supply for chamber 25 u2032 including the air injectors is also pre heated by surrounding the air manifold pipes in water jackets serviced by hot water fig1 is a pictorial view of the fig1 embodiment 20 u2032 except from a vantage point comparable to fig2 this view show aspects of a hot water manifold 82 for supplying the hot water feed to the various.