In yesterday's post about pumpkin seeds the excerpt mentioned rapeseed oil so I did a little research on rapeseed. In the 19th century it wasn't used for food because it had a bitter taste. However it was useful as a lubricant for steam engines and other machinery. I found several sources that rave about the use of rapeseed oil to keep the machinery parts from breaking down. Today the Canola Oil is rapeseed oil that has been bred to a more pleasing taste for food consumption.
After pressing the rapeseed and removing the oil what is left is a cake, these were often feed to cattle.
Another use for rapeseed oil was in the production of soap.