Sewn bellows first attempt. My fingers are sore from sewing with an antler and shards of flint. This one doesn’t work great. This technology is a crucial gateway; without it, my charcoal fire will never reach the 1100 C that it needs to reduce and fuse the copper. Ribs of bent wood give the bag a crude shape as it inflates, and a femur is the outlet. A foldable flap is open and closed by the operator’s hand, functioning as the intake valve.