Forensic Ballistics Equipment Quiz
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Questions and Answers

What is the primary function of a Bullet Comparison Microscope?

  • To clean and maintain firearms
  • To measure the velocity of a bullet
  • To analyze gun powder residues
  • To simultaneously observe two fired bullets for differentiation (correct)

Who is credited with the introduction of the Bullet Comparison Microscope?

  • Dr. Calvin H. Goddard (correct)
  • Hans Gross
  • Francis Herbert Wenham
  • Karl Landsteiner

What is a key purpose of photomicrographs taken with a Bullet Comparison Microscope?

  • To display the gun's model
  • To document findings for court presentations (correct)
  • To maintain equipment calibration
  • To track bullet velocities

What is the primary purpose of the CP-6 Comparison Projector?

<p>To compare two fired bullets simultaneously (D)</p> Signup and view all the answers

Which microscope is primarily used for the initial examination of fired bullets and shells?

<p>Stereoscopic Microscope (C)</p> Signup and view all the answers

Which instrument is best suited for measuring the diameter of a bullet?

<p>Micrometer/Caliper (D)</p> Signup and view all the answers

What technique does INTERMARRIAGE in bullet comparison use?

<p>Merging images of evidence and test bullets in the same view (C)</p> Signup and view all the answers

What advancement is Francis Herbert Wenham known for in the context of forensic microscopy?

<p>Designing the first successful stereomicroscope (B)</p> Signup and view all the answers

What unique function does the Scanning Electron Microscope perform?

<p>Identifies elemental components of small residues (A)</p> Signup and view all the answers

How does the Stereoscopic Microscope assist in firearms examination?

<p>By aiding in the examination of tampered serial numbers (D)</p> Signup and view all the answers

Who invented the Chronograph, a device used to measure bullet speed?

<p>Alfred Lee Loomis (A)</p> Signup and view all the answers

What process is NOT typically associated with Bullet Comparison Microscopes?

<p>Determining the weight of fired bullets (D)</p> Signup and view all the answers

What is the main function of the Bullet Recovery Box?

<p>Recovers test fired bullets for comparison (B)</p> Signup and view all the answers

Which of the following materials is NOT commonly used to fill a Bullet Recovery Box?

<p>Concrete (C)</p> Signup and view all the answers

Which instrument is primarily used to determine weights of bullets?

<p>Analytical or Torsion Balance (C)</p> Signup and view all the answers

What does the Taper Gauge specifically measure?

<p>Bore diameter of firearms (C)</p> Signup and view all the answers

What is the primary function of a bullet puller?

<p>To separate the bullet from the cartridge case (D)</p> Signup and view all the answers

Which device is utilized for marking fired bullets and firearms in a laboratory setting?

<p>Electric Gun Marker/Stylus (D)</p> Signup and view all the answers

What is the purpose of a Helixometer?

<p>To measure the pitch of riflings in firearms (C)</p> Signup and view all the answers

Which part of the Computerized Comparison Microscope is responsible for displaying the magnified image?

<p>Monitor (B)</p> Signup and view all the answers

Where would you find the Central Processing Unit in a Computerized Comparison Microscope?

<p>As part of the body (D)</p> Signup and view all the answers

Which of the following is NOT a basic part of a Computerized Comparison Microscope?

<p>Helixometer (D)</p> Signup and view all the answers

What specific measurement can be obtained using a Filar Micrometer Eyepiece?

<p>The pitch of rifling in turns per inch (D)</p> Signup and view all the answers

What is the role of the Focusing Knob in a microscope?

<p>Make focal adjustments based on the selected magnification (C)</p> Signup and view all the answers

Flashcards

Bullet Puller

Tool used to remove a bullet from a cartridge case.

Electric Gun Marker

Tool used for marking bullets, shells, and guns in a lab.

Filar Micrometer Eyepiece

Microscope for measuring grooves, lands, and rifling in guns.

Helixometer

Instrument used to measure the angle of rifling twist in a barrel.

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Computerized Comparison Microscope

Microscope that displays its images on a computer monitor.

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Comparison Microscope Parts (Monitor)

The screen where the magnified image of the specimen is shown.

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Comparison Microscope Parts (Magnification Knob)

Adjusts the image size on the monitor.

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Comparison Microscope Parts (Focusing Knob)

Adjusts the focus of the microscopic image.

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Stereoscopic Microscope

A microscope with multiple lenses, used to examine fired bullets/shells for class characteristics and orientation.

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Comparison Projector (CP-6)

A tool to project images of two fired projectiles simultaneously for comparison, like a bullet comparison microscope.

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Bullet Recovery Box

A container used to collect test-fired bullets undamaged for later comparison.

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Micrometer/Caliper

A measuring tool used to determine sizes like bullet diameter, bore diameter, and barrel length.

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Analytical/Torsion Balance

Used to measure the weight of bullets/pellets

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Scanning Electron Microscope

A powerful microscope used to identify gunpowder and primer residues, using lasers and computers.

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Chronograph

Measures bullet speed.

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Onoscope

Small instrument examining gun barrels internal surfaces using a tiny lamp.

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Bullet Comparison Microscope function

This microscope allows comparing fired bullets/shells to determine if they came from the same gun. It magnifies and shows the striations (marks) left by the gun.

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Intermarriage method

Method for comparing bullets under a microscope. Combines half of the comparison bullet images to look for matching markings (striations).

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Juxtaposition method

Comparing bullets side-by-side to see if the striations (marks left by the gun) match.

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Stereoscopic Microscope use

Primarily used for preliminary bullet/shell examination to identify class characteristics. Can also be used to examine tampered serial numbers on guns.

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Class characteristics

Distinguishing features of a bullet/shell that are shared by bullets/shells from the same type of gun. These aren't unique to one gun.

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Forensic Ballistics

The field of forensic science that deals with firearms and the evidence they leave at crime scenes.

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Photomicrographs

Images taken through the microscope for use in court proceedings to support forensic analysis.

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Dr. Calvin H. Goddard

Considered the "father of modern ballistics" for developing the bullet comparison microscope and furthering the field.

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Study Notes

Learning Objectives

  • Students will be able to recognize different equipment used in firearms identification.
  • Students will know the functions of laboratory equipment for forensic ballistics.
  • Students will apply knowledge on proper use and care of laboratory equipment.

Introduction

  • Firearms equipment, used by qualified personnel, helps in combating crimes.
  • A fired bullet or shell at a crime scene can be a critical piece of evidence.
  • Laboratories use equipment to identify and analyze evidence in firearms cases.

Bullet Comparison Microscope

  • Designed to differentiate two fired bullets or shells.
  • Observe magnified images simultaneously in a single field.
  • Compare markings for identification.
  • Used to show "intermarriage" (half of the same image) and "juxtaposition" (side by side comparison) of evidence.

Stereoscopic Microscope

  • Used for initial examination of bullets/shells
  • Determines relative distribution of class characteristics to determine orientation purposes
  • Useful for close-up examinations of tampered serial numbers or firearms

Shadowgraph

  • Contains lenses with different magnifications for examining fired bullets and shells.
  • Determines class characteristics.
  • Allows for orientation purposes.
  • Uses ground glass for observations

CP-6 Comparison Projector

  • Similar to the bullet comparison microscope.
  • Projects images onto a large screen for simultaneous viewing of two bullets/shells.
  • Viewing is vertical and comfortable.
  • Invented by William Howard Livens

Bullet Recovery Box

  • Used to examine test-fired bullets and shells
  • Designed to maintain the integrity of the evidence
  • Materials for the box can include cotton, water, sawdust, etc

Micrometer/Caliper

  • Used for measuring dimensions of bullets, barrels, etc.

Analytical or Torsion Balance

  • Used for determining weight of bullets and pellets.
  • Helpful for determining type, caliber, and make of the firearm.

Onoscope

  • Small instrument used to examine the inside of a gun barrel.
  • Includes a lamp for internal examination.

Taper Gauge

  • Used for measuring the bore diameter of firearms.

Scanning Electron Microscope

  • High-powered microscope used to identify gunpowder/primer residues.

Chronograph

  • Measures bullet speed.

Bullet Puller

  • Separates bullets from cartridge cases.

Electric Gun Marker/Stylus

  • Used for marking fired bullets, cartridges, and/or firearms evidence for examination

Filar Micrometer Eyepiece

  • Measuring microscope to read the width of lands and grooves.
  • Measures the twist of the rifling.

Helixometer

  • Measures the rifling pitch of firearms

Computerized Comparison Microscope

  • Similar to the bullet comparison microscope but uses a monitor for image viewing.

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Related Documents

Firearm Identification: Scientific Equipment PDF

Description

This quiz tests your knowledge on various pieces of equipment used in forensic ballistics, particularly focusing on the comparison of fired bullets and shells. You'll learn about the functions and proper care of essential forensic laboratory tools. Understand how these tools aid in crime scene investigations and evidence analysis.

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