Abstract: Apparatus and method for killing mosquitoes outdoors and in the neighborhood of a building normally occupied by humans or animals, has an electrical grid for killing the mosquitoes and which is suitable for mounting adjacent the building and is connectable to a supply of voltage, the grid separating an interior space, usually within the surrounding grid, from the atmosphere outside of the building, and being such that, when the grid is attached to a voltage supply, mosquitoes are killed on attempting to pass through the grid. A duct connects the interior space to the interior of the building so that air containing carbon dioxide produced by occupants of the building passes through the duct and into the interior space where it attracts mosquitoes to the grid for electrocution. Preferably, the apparatus includes a fan for pulling air containing carbon dioxide from inside the building through the duct and into said interior space.

Abstract: Apparatus and method for killing mosquitoes outdoors and in the neighborhood of a building normally occupied by humans or animals, has an electrical grid for killing the mosquitoes and which is suitable for mounting adjacent the building and is connectable to a supply of voltage, the grid separating an interior space, usually within the surrounding grid, from the atmosphere outside of the building, and being such that, when the grid is attached to a voltage supply, mosquitoes are killed on attempting to pass through the grid. A duct connects the interior space to the interior of the building so that air containing carbon dioxide produced by occupants of the building passes through the duct and into the interior space where it attracts mosquitoes to the grid for electrocution. Preferably, the apparatus includes a fan for pulling air containing carbon dioxide from inside the building through the duct and into said interior space.

Abstract: A marker suitable for use in a golf fairway having a base portion suitable for installation in a ground hole, and a hollow upper body portion fixed to the upper end of the base portion which includes a dome formed of resilient material. The dome has a normal, unstressed raised condition in which it protrudes above ground level, to be readily visible to golfers, and has a depressed condition in which it is close to ground level and in which the material is stressed such that it tends to move to the normal, raised condition. A generally closed chamber beneath the dome has one-way valve means which allows air to be rapidly expelled from the chamber when the dome is depressed but restricts air flow into the chamber to delay recovery from the depressed condition.