Abstract: A spraying system comprises a conveyor for conveying a series of boards through a spraying station, spray nozzles at the spraying station and a mechanism for controlling spraying from the nozzles onto the board located at the spraying station. The control mechanism comprises a sensor for sensing the speed of the conveyor, a photoelectric cell for sensing the presence of a board on the conveyor and a logic unit which is positioned and arranged for calculating the length of the board in response to signals from the sensor and photoelectric cell. The logic unit is arranged to activate a supply of liquid flux to the nozzles when the leading edge of the board reaches the spraying station and the nozzles are reciprocated across the conveyor as the board is advanced. Sensors control the nozzles so that spray is delivered only onto the board and is stopped as the nozzles reach the side edges of the board.

Abstract: The device dispenses a dose of material, such as a perfume or deodorant, automatically on closing a door. A storage container for the material connects with a dosing compartment and an actuator releases the contents of the dosing compartment to the surroundings. A valve allows communication between the dosing compartment and the surroundings and is actuated by a holder for the container which is adapted to be fixed to the door or a jamb thereof. The holder has an arm extending radially and being hinged biasedly at a median point. A furthermost portion of the arm is adapted to contact the container or the valve to actuate the valve when the hinged portion of the arm is compressed by a gap between the door and the jamb thereof.

Abstract: An `in-line` unit for use in compressor station piping, arranged to reduce the level of noise generated when the blowdown valves of the station piping are opened in an emergency to vent the high pressure gas therein to atmosphere, the unit comprising a pipe section having a plurality of orifice plates the number and hole area of which is designed to ensure sub-sonic flow through each plate. The unit is preferably used in combination with a modified form of silencer element connected `in-line` downstream thereof.