English: Key: "The stock is cut off between the shear blades a, b, the lower one of which is stationary and the other is attached to the short end of the lever c, the long end being moved by a crank or a cam. In the shear shown, two flywheels d, d are placed on the main driving shaft, so that their inertia will assist in operating the shear and enable it to cut heavier stock..."