In this class, the following terms are used with the meanings indicated:
"Semi-automatic firearm" — a firearm from which one shot is fired after actuation of the trigger and which then returns to a condition for firing a subsequent shot upon renewed actuation of the trigger.
"Automatic gun" — a gun which will continue firing so long as the initial firing pressure is maintained on the trigger.
"Sighting" — bringing into visual coincidence a direction defined by a so-called "sighting" device with the direction of a target.
"Aiming" — bringing a weapon to a direction differing from the sighting direction by corrections in order that the projectile may hit the target.
"Laying" — setting a weapon in the correct position for hitting a mark.