Patent for a new and improved anti-friction wagon slide. This design "consists of flat side pieces provided with bolt-holes near their ends, and connected to diametrically-opposite points of nearly-cylindrical end pieces, which have holes through their axes for the reception of the roller-shaft. The recess is so formed that the lower portion of the end pieces shall bear against its ends when the frame is put in place. This arrangement, together with the bolts through the corners of the frame and the coupling-tongue, prevents any tendency of the frame to displacement" (lines 42-54).