Originally posted by Just Curious
Jaime,
Every electronic marker can be made to fire by 'bumping' it. it just depends on how stongly/hard it is done.
That is a down-right lie.
In order for a marker to fire when bumped, the acceleration of the marker caused by the bump must be enough that the force against the trigger spring caused by accelerating the trigger to the same velocity as the marker is big enough to make the marker fire.
It is very easy to have a light enough trigger and a strong enough spring that no amount of human-generated velocity change (short of dropping it off a building) would cause the marker to erroneously fire.
F = ma
Force exerted by a spring increases as it is compressed; as long as the force exerted just before the trigger passes the firing point exceeds the accelerationg caused by bumping hte marker times the mass of the trigger, you're good.
So, there is simply no excuse for a marker that fires due to a "bump" other than the user being a moron.