In one aspect, a method of dispensing a test strip is provided in which the dispensed test strip remains stationary while the inner housing moves within an outer housing. The device incorporates a damper arrangement and a heat detector comprising a metal alloy or lead which melts when a present temperature is reached, causing the damper arrangement to seal off associated pipework or ducting. The conveying system further includes an auxiliary conveyor in contact with and moveable over at least a part of the main conveyor extension upper surface. This invention makes long hours of computer work comfortable and helps to overcome computer vision syndrome. The weft yarns alternately picked from right and left are crocheted with the respective preceding weft already picked.