before bottom center

before bottom center

before bottom centerclick for a larger image
Beaufort scale.
before bottom centerclick for a larger image
Position of the piston in the cylinder at before bottom center position. When the piston reaches bottom dead center, the position and the crank throw are in line.
The position of the piston in the cylinder of a reciprocating engine as the piston is moving downward, just before the bottom of its stroke, with the crankshaft turning in the direction of normal rotation.