A torch includes a tank adapted to contain a fuel, a firebowl atop the tank defining a fill opening, and an operating device that fits over the firebowl as a snuffer. The invention may use calcined trona ore from the deposits in the Green River Valley area of Wyoming, USA. The fluid composition may be a viscoelastic fluid that is delivered into the canal to facilitate drainage of aqueous humor by disrupting the canal and surrounding trabeculocanalicular tissues. The movement of the first window panel and the second window panel along the first path and the second path respectively allows for the first door and the second door to be independently openable relative to each other. Upon termination of the channel search, the two counters are compared and the switch is fixed to the side on which more channels can be normally received.