A temperature compensating method of laser power in an optical disk storage apparatus is disclosed whereby temperature is compensated so that laser power outputted by a laser diode can be constantly outputted regardless of temperature changes. A bound crossfold booklet, the equivalent of or a small catalog, which is particularly adapted for large mail distribution is provided. The connector includes a pair of annular securing members respectively extending from two opposite sides thereof. The first membrane is characterized by being permeable to gases and impermeable to liquids and aerosols. A first series of markings sized and located to show through the second set of openings will indicate the piano keys related to the chromatic scale selected. The maxillary bite pad and the mandibular bite pad are engageable at the guide plane for advancing the mandibular tray along the guide plane upon vertical closure between the trays.