thermal pain

Next logical phase in attaining the illusive 400° mark with the solar oven project is to eliminate heat loss.  Prepped for the addition of a second sheet of 1/4" thick tempered glass to the mix - creating a thermal pane effect.  Dug through my storage but couldn't find my router so resorted to plunge cutting the channel with my circular saw.  Got a late start and too late in the day to test by the time I got finished.  67,75,63,0,B