device for automatic ascent of fyke nets, kreftburar, net and similar

摘要

A device for automatically raising fish traps, crayfish pots, nets and the like comprising a cylinder of compressed gas connected through a control valve to a buoyancy chamber provided with a discharge opening and adapted to be filled with water when the trap is submerged, the operation of the control valve is to allow gas to pass from the cylinder to the buoyancy chamber and expel water from the buoyancy chamber being effected through a timing mechanism or an electrical circuit activated by a signal transmitted through the water.