Can for flux

Claim 1

IN A CONTAINER INCLUDING A WALL, THE IMPROVEMENT COMPRISING SAID WALL HAVING AN EXTERNAL SURFACE THAT IS GENERALLY FRUSTO-CONICAL IN CONFIGURAITON ABOUT AN AXIS THAT PASSES THROUGH THE INTERIOR OF THE CONTAINER, SAID EXTERNAL SURFACE BEING CONCAVE TOWARD THE EXTERIOR OF THE CONTAINER AND BEING OF AT LEAST SUCH AN EXTENT IN AREA THAT THE AREA OF PROJECTION OF SUCH SURFACE UPON A PLANE NORMAL TO SAID AXIS CONSTITUTES A MAJOR PROPORTION OF THE AREA OF PROJECTION OF THE ENTIRE CONTAINER UPON SAID PLANE, SAID WALL HAVING AN ACCESS OPENING THERETHROUGH AT A POSITION SUCH THAT SAID AXIS EXTENDS THROUGH THE OPENING, SAID EXTERNAL SURFACE BEING PROVIDED WITH A PLURALITY OF GUIDES EXTENDING RADIALLY FROM POSITIONS SPACED ABOUT THE PERIPHERY OF THE ACCESS OPENING, AND ESSENTIALLY THE ENTIRE EXTENT OF SAID EXTERNAL SURFACE ABOUT SAID ACCESS OPENING BEING SLOPED TOWARD THE OPENING AND THE INTERIOR OF THE CONTAINER TO CONSTITUTE A MEANS FOR SLIDINGLY AND CAMMINGLY DIRECTING AN END OF AN OBJECT URGED AGAINST SUCH SURFACE BY A FORCE GENERALLY PARALLEL TO THE AXIS TOWARD AND INTO SAID ACCESS OPENING, WITH SAID GUIDES EXTENDING TO CONFINE THE POSITION OF ENGAGEMENT OF THE EXTERNAL SURFACE WITH AN OBJECT TO AN ANGULAR SEGMENT OF THE EXTERNAL SURFACE DEFINED BY ADJACENT GUIDES.