When T-rails are repaired by welding a new piece on to a rail already worn, or by hammering a rail that has become bent, back to its proper shape, it is necessary, to preserve the shape of the rail, that an anvil be made on purpose, of the proper form ; and it has hitherto been difficult to hold T-rails in a vise without injuring their shape when at red or welding heat. The invention which we are about to describe provides this desideratum, as will be seen by reference to the accompanying engravings. Fig. 1 is a perspective view of the whole apparatus, A being a bed plate, on which is secured the block, B, by means of the mortises and tenons, a. Acrossttns block are depressions, b and c' c'[J*(IHinVtfee-sLuLXaHi. ous positions-go that it can be worked upon with ai'much facility as if it were a square - -pce on a flat bed. In the bed, A, are two semi-circular depressions, in which rest the semi-circular projections, e, of the lever jaw, C, and serve as a hinge on which it can be moved by the foot lever, F. This lever jaw hap a rounded edge, d, at its upper end, which fits into and firmly grasps the central depres-TJ sion of the rail ; it has also a semi-circular X projection, e', on which a corresponding de-fe pression, /, of the locking jaw, D, moves as on a hinge. These jaws are kept in the proper position by a flange, h, on the bed, A. The locking jaw, D, has an edge, d', corresponding to d, and the rail is firmly held between them, so that any blow or pressure on the rail while between them renders it firmer and more rigid, and haa no tendency to produce a recoil. The piece D has an elongation, g, which presses against a raised piece, h, of the bed, A, and should they not meet, shoe pieces, I, can be placed between them, to render the meeting rigid. The locking jaw, D, is hollowed out at i, to admit of scales, chip-pings, and sparks passing through, and it does not at all detract from the strength of the vise. The lever, F, is hinged to the jaw by a pin,/, seen in Fig. 2 and 3, which are views of the jaws detached, and Fig. 4 is an end view of them closed, grasping a rail. The inventors and patentees are Sanford Mason and Edward Davis, of Michigan City, Ind., from whom any further particulars can be obtained. The device was patented April 6th, 1858.