11. The Epiphany fire chamber , inserts and valve spring are available as performance upgrades for the Ion and SP-8. 12. Semi-automatic pistols use one firing chamber that remains fixed in a constant linear position relative to the gun barrel. 13. The wood burning stoves saw improvement through the addition of fire chambers that allowed better containment and release of smoke. 14. Failure to Feed ( FTF ) is when a firearm fails to feed the next round into the firing chamber . 15. To intensify and channel the explosion an oblong " fire chamber " was constructed on each ship, a metre in diameter. 16. The brickworks have circular shape with a firing chamber built using a technique with casts of pebbles stuck together with mortar. 17. The casemate is a simple flanking one, meaning that it has just only one firing chamber which is directed towards the north. 18. Around 1870, machined tolerances had improved to the point that the cartridge case was no longer necessary to seal a firing chamber . 19. This was something of a compromise between the other types, and offered locations in the firing chamber with a range of firing conditions. 20. Bottled oxygen can be added to the firing chamber , though this can cause an explosion of the pipe when firing, potentially injuring anyone nearby.
