Forensic Science > Lab Report > Bullet Comparison Microscope Lab 2 (All)

Bullet Comparison Microscope Lab 2

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Bullet Comparison Microscope Lab Purpose and Background: Microscopes provide a direct image of a small object of interest ... that often would not be seen by the naked eye. A comparison microscope is a version of the compound microscope that magnifies two different samples at the same time, side by side, and can even overlay one image over another. This is useful for comparing two bullets or casings to see if they are microscopically similar and came from the same source. When evaluating firearms, it is essential to see if any of the tiny striation markings on bullets and casings can be matched to a gun. This is because the majority of guns leave unique patterns due to the rifling process during their manufacture. In this lab, you will compare unknown bullets and casings from crime scenes to test-‐fired standards using a virtual comparison microscope. It is essential that you follow all steps in the procedure and read all tutorial and training information. This lab will take some time, but will give you some indication of the process that investigators use to identify bullet and casing markings! Materials: None needed. Procedure: 1. Go to: http://www.firearmsid.com/classroom/class_login.htm 2. Log in using the following login-‐key (C44849Forensic Science) and your first and last name. Copy and paste the bolded login-‐key below directly into the login-‐key space on the webpage. If you type it instead, be aware that the login-‐key is case sensitive and has a space between Forensic and Science. Login-‐Key: C44849Forensic Science Enter your first and last name in the space where indicated under the login-‐key space. 3. Once you are logged in to our classroom page, scroll down and click on “Bullet ID-‐VCM”. 4. Click on the section titled “Rifling Impressions” and answer the following questions: A. The rifling pattern in the barrel that fired a particular bullet can be determined by: B. Lands and grooves are measured in: C. Widths of lands and grooves on a bullet are _______________ characteristics [Show More]

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