Wrot Iron Heater Co. Movable Measurements / Advertisement

Des Moines, IO: Wrot Iron Heater, 1915. First edition; 7 x 3 1/4; die-cut card stock enclosing a second movable printed sheet; illustrated; small rubbed spots along edges; overall very good.An unusual survivor, the piece advertises The Furnace "De Luxe" and allows potential buyers to determine the exact diameter, in inches, of the basement pipe required for installation, by sliding the movable part to form a grid with various widths of a room (both for first and second floor ones).