Editing Cannon (section)

=== Negative spaces ===

; Bore: The hollow cylinder bored lengthwise down the centre of the cannon, including the ''base of the bore'' or ''bottom of the bore'', the nearest end of the bore in which the [[Artillery|ordnance]] ([[wadding]], [[Round shot|shot]], etc.) rests just before firing. A cannon's [[Caliber (artillery)|calibre]] is determined by the diameter of its bore.
; Chamber: The cylindrical, conical, or spherical recess at the nearest end of the bottom of the bore into which the [[gunpowder]] is packed.
; Vent: A thin tube on the near end of the cannon connecting the explosive charge inside with an ignition source outside and often filled with a length of [[fuse (explosives)|fuse]]; always located near the ''breech''. Sometimes called the ''fuse hole'' or the ''touch hole''. On the top of the vent on the outside of the cannon is a flat circular space called the ''vent field'' where the charge is lit. If the cannon is bronze, it will often have a ''vent piece'' made of copper screwed into the length of the vent.