1. AN ACETYLENE GENERATOR COMPRISING A TANK ADAPTED TO CONTAIN WATER, AND HAVING AN OPENING IN ITS TOP, A REMOVABLE COVER FOR SAID TANK, A VERTICALLY MOVABLE CARBIDE BASKET IN SAID TANK ALIGNED WITH SAID OPENING SO AS TO BE REMOVABLE THERETHROUGH WHEN SAID COVER IS REMOVED, AT LEAST ONE COUNTER-PRESSURE BOX SEALED AT ITS UPPER END TO CONTAIN A PRESSURE REGULATING AIR CUSHION AND HAVING AT LEAST ONE ORIFICE ADJACENT ITS LOWER END OPENING INTO SAID TANK BELOW THE LOWEST WATER LEVEL, A SUPPORT MEMBER ON WHICH THE LOWER END OF SAID BOX RESTS, SAID SUPPORT MEMBER BEING ATTACHED TO THE INNER SURFACE OF THE TANK AND SPACED FROM THE TANK BOTTOM, SAID MEMBER AND SAID BOX HAVING CONFORMING SURFACES ADAPTED TO RESTRAIN THE BOX AGAINST LATERAL DISPLACEMENT, AND MEANS FOR HOLDING THE UPPER END OF THE BOX AGAINST LATERAL DISPLACEMENT INTO THE PATH OF SAID BASKET, SAID HOLDING MEANS BEING ACCESSIBLE FOR REMOVAL ONLY WHEN SAID COVER IS REMOVED, SO THAT