Abstract: This invention relates to a marine jet drive having improved operation, especially in regard to having efficient adaptation to propulsion engine and hull design; having a drive shaft with flexible coupling at each end, internal to the jet drive; having through-the-nozzle engine exhaust; having simplified, combined means of steering and reversing; having controllable nozzle aperture and trim control; having combination reverse flow deflector and trim plane; having means to disengage the engine from the jet to obtain true neutral; having protection from and removal of debris in the water intake duct; generally having fewer overhauls, easier serviceability and lighter weight.

Abstract: A rapid succession of objects such as sweets are sorted according to shape by being fed through a viewing zone, flash illuminated in the viewing zone, and viewed by a number of fixed electronic viewers spaced in one plane around the viewing zone through just under 180.degree., the edges of the images produced by the viewers being examined for approximation to a spherical shape, approximation to symmetry and reentrants, and one of a number of air jet nozzles being thereby automatically energised to direct the object into an appropriate bin.