Abstract: A rotary type inverter capable of generating a variable pulse train electro-mechanically for converting D.C. to A.C. with a Sine wave shape, and consists primarily of a D.C. electric motor driving a "variable pulse width" generating drum. Mounted over this drum are electrical current collecting sliding brushes. These are first: To bring in input D.C. source voltage to an electrically conductive slip ring imbedded 360 degrees into a solid drum made of electrically insulating material; Second: To collect the A.C. voltage output generated by electrically conductive segments of variable widths, also imbedded upon and around this electrically insulating drum material.