=The Reverse Lever= is that part of the valve gear connected with the
link for raising and lowering it, thereby changing the travel of the
valve and reversing the motion of the engine. When the reverse lever
is placed in the center notch of quadrant, the lap of slide valve
should cover both steam ports, preventing any steam from entering the
cylinder, thus stopping the engine. In moving this lever from the
center notch, it either drops or raises the link as the case may be,
increasing the travel of the valve and allowing steam to enter the
cylinder. When the reverse lever is thrown into the outside notch of
quadrant at either end you get full travel of the valve which gives
full power of engine, providing you have sufficient steam pressure.