1. 1835
Henry Goddard of Scotland Yard use a bullet comparison to solve a murder. He traced a flaw in the bullet’s shape to the pistol of a suspect.

2. 1889
Alexandre Lacassagne, University of Lyon, matched individual bullets to specific gun barrels.

3. Comparison Microscope
The comparison microscope enables two samples to be viewed side by side, so that similarities and differences are apparent.

4. 1974
SEM Images of GSR particles. Typically, GSR particles are very small (0.5 to 10 microns), spheroidal and contain combinations of lead, barium and/or antimony.
Electron microscope technique developed for the detecting of gun shot residue (GSR).

5. Ballistic Firearms

6. Ballistic Firearms Include handguns & rifles
Information from the shot can be used to determine type of weapon, caliber of the weapon and distance between the shooter & weapon

7. Handguns
Occur in two forms:
Semiautomatic and Revolvers

8. Bullet cartridges

9. Speed loader
for revolver

11. Rifles
Lever Action

13. Shotguns
Shotguns

14. Generic Shotgun Shell

15. Shotgun Cartridge

16. Cartridge

17. Semi-automatic

18. Rifling

19. Rifling

20. Chambering & Firing a Round

21. Recoil
Ouch!

23. Firing a Round & Ejecting the Cartridge

24. Build a Trajectory Device
For a Class Activity

25. Build a Trajectory Device

26. Cost ~ $22 with laser
~ $5 without laser

29. Trajectory Angle
Bang !

30. Angle of Entry

31. Check out the Lab Activities
Bullet trajectory
Firing pin cartridge match
Building a trajectory device

32. The End!