Resistors obtained from sheet material

An improved electrical grid resistor of the type comprising a thin, flat, metal sheet having a pair of spaced side edges, a first plurality of spaced slots in said sheet opening at one end on one of said side edges and extending from said one side edge transversely of said sheet and part way only toward the opposite side edge thereof, a second plurality of spaced slots formed in said sheet in spaced, alternating relation with said first plurality, each of said second plurality of slots opening at one end on said opposite side edge of said sheet and extending from said opposite side edge transversely of said sheet between an adjacent pair of said first plurality of slots, and part way only toward said one side edge of said sheet, and characterized by the fact that at least one each of a first plurality of spaced, electrically conductive plates is fastened in electrical contact with at least one surface of said sheet at the inner, closed end of each of said slots, each of said one plates overlying said one surface of said sheet only in the areas at the inner end of the associated slot and adjacent side portions thereof, each of said plates being generally semi-circular in configuration and having in the diametral side thereof a notch which is similar in configuration to, and which registers with, the inner end of the associated slot in said sheet, whereby the plate conforms to the configurtion of that portion of the sheet which is immediately adjacent to the inner end of the associated slot, including the areas at the sides of the slot.