1. A method of preventing edge cracking in continuously casting of metal-like material between at least one pair of spaced, parallel aligned rolls comprising: feeding molten material between a pair of rolls, reducing the thickness of the cast molten material as it passes between the rolls, each of said rolls having a pair of circumferential grooves in registry with corresponding grooves of the opposing roll, and engaging the lateral edges of said molten material with a pair of substantially incompressible elongated restraint members, each of said restraint members being received in and guided by a pair of opposed grooves and being substantially inflexible throughout the entire zone of rolling contact, said restraint members restraining the lateral edges of the molten material throughout the zone of rolling contact, moving said restraint members rectilinearly at a velocity substantially equal to the peripheral velocities of said rolls with the molten material to prevent lateral deformation of said molten material while reducing the thickness thereof, whereby the tensile forces along the lateral edges of the molten material are sufficiently reduced to prevent edge cracking.

3. A method of preventing edge cracking in continuously casting of metal-like material between at least one pair of spaced, parallel aligned rolls comprising: feeding molten material between a pair of rolls, reducing the thickness of the cast molten material as it passes between the rolls, each of said rolls having a pair of circumferential grooves in registry with corresponding grooves of the opposing roll, and engaging the lateral edges of said molten material with a pair of substantially incompressible restraint meMbers, each of said restraint members being received in and guided by a pair of opposed grooves so as to move rectilinearly with the molten material and be substantially inflexible throughout the entire zone of rolling contact, said restraint members restraining the lateral edges of the molten material throughout the zone of rolling contact to prevent lateral deformation of said molten material while reducing the thickness thereof, whereby the tensile forces along the lateral edges of the molten material are sufficiently reduced to prevent edge cracking, said restraint members comprising a pair of looped endless flat bars, said bars being incompressible relative to the material being cast, each of said bars having a central portion of its width engaging the molten material and having its edge portions supported by its respective pair of opposing grooves.