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Ballistics Mind Map, image, image, image, image - Coggle Diagram
Ballistics Mind Map
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How a bullet is fired
The gun barrel contains spiral grooves
that cause a bullet to spin, improving its
stability and accuracy. This is called rifling.
When the bullet passes through the gun
barrel, a bullet takes on a mirror image of
the rifling, called engraving.
Engraving consists of major features of the barrel that are visible to the naked eye, but also minor features like distinctive scratches and marks that can only be seen through a microscope. It is this characteristics that allow an investigator to associate or exclude a piece of recovered ammunition to a firearm from which it was discharged.
While performing lab work, an instrument known as the comparison microscope is used to analyze specimens side by side. This microscope allows you to have a split view image, allowing two separate objects to be compared simultaneously.
This whole analysis can help a forensic analyst determine whether a bullet recovered from a crime scene was indeed fired by a determined firearm.
Wound Ballistics
When a bullet passes through human skin, the surrounding tissue will be pushed away in a radial manner, leaving a temporary wound cavity that has a much larger diameter than the diameter of the bullet
The temporary nature of this cavity results from the natural elasticity of the human skin, which regains its natural structure once the bullet has passed
There is also a permanent cavity resulting from the destruction of tissue caused by the bullet itself.
The permanent cavity is dependent on the cross-sectional area of the bullet and any secondary missiles produced due to bullet fragmentation during its passage.
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Firearm Classification
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Rifled bore: Rifles, revolvers, pistols, machine guns...
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