The author suggests a new method and a new inexpensive, large blade-rope type wind rotor, that will be suspended at high altitude and produce huge quantities of energy. A fuel passage and an air passage are in communication with the fuel and air mixing chamber. The selected material has an atomic percentage in a range of about 10% to 25%. An interfering light generator combines the at least two reflected lights and the at least two reference lights having corresponding different optical path lengths, to generate at least two interfering lights. As a result that a transient response is diagnosed under this state, in the case where the occurrence of response delay is not judged, it is judged that a response diagnosis function is abnormal. The independent support member is easily attached to a head-engaging device and eyeglasses to enhance support of the eyeglasses.