Three questions about nitrogen lasers: What kind of power is needed to fire a TC gap? Does the laser have to shine on one of the gap's electrodes, or can it just go through the actual gap? Can a N2 laser work with air, or does it need pure nitrogen? If so, how can I produce it cheaply? --Mr. Postman (Doug Brunner) <<mailto:dabrunner-at-earthlink-dot-net>dabrunner-at-earthlink-dot-net>