Molecular still of the rotary wiped film type

Claim 1

A MOLECULAR STILL WHICH COMPRISES A TUBULAR CONDENSER HAVING A SURFACE WHICH IS SYMMETRICAL ABOUT A HORIZONTAL AXIS OF REVOLUTION, A TUBULAR EVAPORATOR HAVING AN INTERIOR SURFACE WHICH IS FIXED AND SYMMETRICAL ABOUT SAID HORIZONTAL AXIS OF REVOLUTION SAID EVAPORATOR SURFACE SURROUNDING AND BEING GENERALLY PARALLEL TO AND FACING THE CONDENSER SURFACE, A FIRST HELICAL WIPE MEMBER IN CONTACT WITH SAID EVAPORATOR SURFACE OVER SUBSTANTIALLY THE ENTIRE LENGTH OF SAID EVAPORATOR SURFACE, A SECOND HELICAL WIPER MEMBER IN CONTACT WITH SAID CONDENSER SURFACE OVER SUBSTANTIALLY THE ENTIRE LENGTH OF SAID CONDENSER SURFACE, A RESIDUE GUTTER AT ONE END OF SAID EVAPORATOR SURFACE, A DISTILLATE GUTTER AT THE OTHER END OF SAID EVAPORATOR SURFACE, A PLURALITY OF GUIDE DUCTS ATTACHED TO THE SECOND WIPER MEMBER AT THE UNDERSIDE OF THE CONDENSER, AND A DISTILLAND FEED INLET INTO THE EVAPORATOR LOCATED BETWEEN THE RESIDUE AND DISTILLATE GUTTERS, SAID FIRST HELICAL WIPER MEMBER BEING ROTATABLE ABOUT THE HORIZONTAL AXIS OF THE EVAPORATOR SURFACE SO AS TO CAUSE AXIAL DISPLACEMENT OF LIQUID ALONG THE EVAPORATOR SURFACE TOWARDS SAID RESIDUE GUTTER, SAID CONDENSER BEING ROTATABLE ABOUT ITS HORIZONTAL AXIS AND SAID SECOND HELICAL WIPER MEMBER BEING STATIONARY SO AS TO CAUSE AXIAL DISPLACEMENT OF DISTILLATE ALONG THE GUIDE DUCTS IN THE DIRECTION TOWARDS THE DISTILLATE GUTTER.