A method of manufacture of globular light bowls

摘要

1,094,471. Blow-moulding. CHARLES TENNANT & CO. Ltd. Aug. 17, 1964 [May 16, 1963], No. 19461/63. Heading B5A. [Also in Division E1] An extruded plastics parison, e.g. P.V.C., polythene, polystyrene or nylon, which is largely semi-translucent but has a translucent strip is blow-moulded to form a seamless light bowl for a Belisha-type beacon having a clear segment defined by a pair of semicircular arcs.