Abstract: The apparatus of the present invention comprises an adjustable form adapted for use in creating a refractory lining in a metallurgical vessel. The form includes a substructure defined by a plurality of struts and braces covered on its exterior perimeter by a plurality of panels. A plurality of connectors permits variation of the substructures exterior perimeter. The panels are secured to the substructure so that alteration of the shape of the substructure causes the affected panels to slide over one another. Advantageously, the panels remain free of fasteners or other protrusions, thereby facilitating removal of the apparatus from the vessel after the lining has hardened.