The box with the crank handle is called
the lubricator. The lubricator distributed oil to four
different positions on each cylinder. Seven of the lubricator tubes can be seen to the rear of the lubricator box.
The hand crank was used to pump oil before the engine was
started and after the engine was turned off. While the engine was running, the motion of
linkage on the right front face of the box drove the internal oil pump.