1. AN APPARATUS FOR FORMING A DEPRESSION IN A PREDETERMINED AREA OF THE GLASS HOUSING OF A SEALED SWITCH COMPRISING A ROTATABLY MOUNTED MEMBER HAVING AN OPENING THEREIN MOVABLE THROUGH A GIVEN PATH, HOLDING MEANS FOR SUPPORTING A SEALED SWITCH WITH THE PREDETERMINED AREA ON THE HOUSING IN THE PATH OF MOVEMENT OF THE OPENING, HEATING MEANS DISPOSED ADJACENT THE SWITCH WITH THE MEMBER INTERPOSED THEREBETWEEN, ANDDRIVE MEANS FOR MOVING THE MEMBER SO THAT THE OPENING PASSES BETWEEN THE HEATING MEANS AND THE HOUSING TO PERMIT HEAT TO BE APPLIED TO THE HOUSING TO FORM A DEPRESSION IN THE PREDETEMINED AREA.

11. A METHOD OF FORMING DEPRESSIONS IN THE GLASS HOUSING OF A SWITCH INCLUDING A PAIR OF MAGNETIC ELEMENTS SEALED AT LEAST PARTIALLY WITHIN THE HOUSING AT A SUBATMOSPHERIC PRESSURE, WHICH METHOD COMPRISES THE STEPS OF HEATING THE SWITCH TO INCREASE THE PRESSURE WITHIN THE SEALED HOUSING WITHOUT RENDERING THE GLASS HOUSING PLASTIC, AND THEN APPLYING LOCALIZED HEAT TO AN AREA OF THE HOUSING TO SOFTEN THE GLASS IN THIS AREA TO PERMIT IT TO MOVE INWARDLY AN AMOUNT DETERMINED AT LEAST IN PART BY THE PRESSURE WITHIN THE HOUSING.