WEDGE PRESS and olive oil
The remains of a Roman painting, shows the use of this type of press that was already used on the I century before Clinio. Was made with a thick frame of four planks in which both vertical sides had interior grooves in which they fitted three horizontal mobile beams. The olives in a sack or basket were placed under lower the beam. Between each beam and in opposite direction, were introduced strong wedges and two man had to blow with thick mallets one on each side to exert pressure.
Wedge press was used for Romans to produce olive oil