A gas discharge device with one or more gas filled Plasma-tubes on or within a rigid, flexible, or semi-flexible substrate with each Plasma-tube being electrically connected to one or more electrical conductors such as electrodes. The guide element is substantially offset from the lateral center of gravity of the ink stick body. Methods of drilling wellbores include drilling a bore with a pilot bit, and reaming the bore with a reamer bit having cutters in shoulder regions of the reamer bit that have an average effective back rake angle greater than that of cutters in shoulder regions of the pilot bit. The trap is installed by extending the tube around a trunk of the plant, so that its two opposing ends face each other, and inserting one end of the tube inside the opposing end by urging open the slit at the outer end to enlarge the outer end and gripping the inner end by an inward resilient load from the outer wall of the outer end. The presence of lime particles in the offgas effectively protects the boiler tube surfaces from corrosion which would occur at optimum scrubber temperatures, and subsequently provides the lime required as a scrubbing medium for the dry scrubber.