In a spectroscopic process a sample for producing a test spectral line or spectrum of at least one component contained in the sample is stimulated and the transmitted andor emitted electromagnetic rays are used to create the test spectral line or spectrum. A removable light guide mount for use with a laryngoscope blade, the light guide mount being removably slidingly insertable into a suitably shaped and dimensioned slot formed in a base portion of the blade, and secured therein by an inter-engagement means, and preferably a snap-fit inter-engagement means. The cooling water passage supplies the cooling water from the upstream water passage to each of the first and second parallel water passages to cool the catalyst housing passage by the first parallel water passage disposed along the catalyst housing passage and cool the exhaust collecting passage by the second parallel water passage disposed along the exhaust collecting passage. The computing unit panel, in particular, may be shaped and positioned on the inside of the bag front to form a front wall support to assist in storing the display panel in the storage area on the outside of the bag front.