Device for linear measurement

A device for the linear measurement of a hot workpiece to be separated by a torch-cutting machine comprising a water cooled measuring roller, a rotatable shaft, said roller being mounted on said shaft for rotation therewith, said shaft being rotatably mounted in tilting means, said tilting means moving said shaft and said roller to and form a position where said roller contacts the underside of the hot workpiece which in turn moves with respect to said roller whereby said roller is caused to rotate by the relative motion of the workpiece, transmitter means for said roller for determining a measuring length in accordance with said rotation of said roller and for connection with a control device of a torch cutting machine, said shaft having a cooling channel therein whereby said shaft is hollow, a water supply on said shaft communicating with said cooling channel, said cooling channel terminating in said roller whereby water may flow to said roller, said roller having a flange on one side of said roller to which said shaft is secured, and said roller being open to the atmosphere on the side of said roller opposite said flange whereby water flowing into said roller may be expelled to the atmosphere through said open side.