Samuel Blatchford

“ It is an inevitable consequence of the use of two dies in such a way, on two pieces of metal of proper size, heated to a welding heat, that swaging or welding will take place by the impact of the dies; that, when the dies have tongues and depressions in them, the metal acted on by such tongues and depressions will take the shape, in form and thickness, of the space left between the tongues or the depressions ”

“ If it was desired to preserve a channel in the bottom rail of the dash-frame, when the bottom rail was made of channeled iron, it was obvious, and not a matter of invention, that the die must be provided with a tongue to fit into the channel, to prevent the filling up of the channel by the forcing into iy of metal by the action of the dies in welding the two pieces together. ”