On some remarkable and hitherto unobserved phenomena of binocular vision.

1,195,945. Extruding plastics. MIDLANDROSS CORP. 16 April, 1968 [14 April, 1967], No. 17937/68. Heading B8A. Plastic material in hopper 11 is stirred by stirrer 23 and discharged to extruder screw 21 by screw 14 driven by motor 16. The screw 14 is formed with a wider upper portion and a narrower lower portion and the hopper 11 is formed with ridges 31 to prevent rotation of material. In this way excess material from the screw rises into the hopper, and overloading of the screw is prevented.