Abstract: Method and apparatus for refining oil which in heated condition is used in the production of consumable products such as French fried potatoes by feeding the oil immediately after starting the baking process through a filter system within the time within which free fat acids or fat acid oxydation products could be formed.

Abstract: A method is disclosed for refining oil which in heated condition is used in the production of consumable products such as French fried potatoes. The oil is fed through a filter system immediately after starting the frying process and within the time within which free fatty acids or fatty acid oxidation products could be formed.

Abstract: An electronic signal representative of a sound is processed by applying different amplitude adjustments to the different components of the signal, these amplitude adjustments vary with frequency in a manner corresponding to the variation with frequency of the auditory response of a normal human listener for sounds impinging on him from a preselected direction of perception. When the electronic signal is converted into sound, the relationship of the amplitudes of the various components of the signal causes the listener to believe that the sound is impinging on him from the preselected direction.