may further include intersecting grooves and ridges intersecting the first mentioned ridges and grooves these ridges and grooves varying substantially randomly in height and depth two or more vapor generators may be arranged such that the vapor generated thereby and vapor pressure are additive a method for fabricating an improved vapor generator comprises the steps of providing two thermally conductive parts with hollow interiors including at least one vaporization member defining a plurality of holes and welding the two parts together the vapor generator may be composed of aluminum stainless steel or other thermally conductive material application_number US 48401995 A description referring to fig1 3 inclusive a superheated vapor generator 10 comprises a pair of metal castings in two sections 12 14 nestable with one another and welded together at weld 16 the welded together generator 10 is of generally cylindrical exterior configuration though of course in accordance with the invention other shapes may be employed in particular applications vapor generator 10 comprises a body or housing 17 which defines centrally therein a vaporization chamber 18 chamber 18 as depicted is substantially spherical however in particular applications other configurations may be employed in accordance with the invention in the depicted spherical configuration the periphery.