The cheeks of this press are of wrought iron, the head is of cast iron, very strong, and secured in its place by screws and nuts, and appears sufficient to bear the greatest power that can be applied in the ordinary process of printing, without injury.
The pressure is obtained by a spindle with a screw working in the head, and at the bottom of it is a collar in which are fixed two studs of case-hardened iron with convex faces, which act upon two inclined planes of unequal degree of inclination; so that, when the platen first begins to descend, the descent is quick, but as the platen reaches the point of pressure, the velocity is diminished and the power proportionably increased, till arriving at a part of the plane nearly horizontal, and the levers taking the most advantageous positions, the highest degree of pressure is obtained.
The inclined planes are of hard steel, dovetailed in the bottom of a circular brass box resting on the centre of the top of the platen; it contains oil, so that the studs dip into it every pull. The power is obtained by the bar being attached to a multiplied cross arm lever. Should the inclined planes break, or be injured, they can easily be taken out and replaced with new ones.