Oil Mill "De Zoeker" (The Seeker) at the Zaanse Schans (Zaanstad - Holland)
The heated mass of seed (in this case peanuts) is then put into two woolen bags. Because the bags are going to be pounded repeatedly,
each bag is put into a covering made of horsehair and leather (as seen in the above photo). The whole is put into a wooden space in the oil press. Then the pounding begins: again and again, the striking ram is brought down with great strength on the pressing wedge which presses the bag sideways against the spacing blocks, squeezing the oil out of the seeds. After the oil has been presses, one stroke from the releasing ram on the releasing wedge is enough to release the pressure (of about 250 atm) from the block.