FIEARMS THE LAE AND FORENSIC BALLISTICEpdf电子书版本下载

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1 The Beginnings 1

1.1 Blowpipes, Air, and Gas Guns 11

1.2 Percussion Ignition 12

1.3 Modern Rim-Fire and Center-Fire Cartridges 13

1.4 Smokeless Powders and Modern Arms 17

Further Reading 24

2 Firearms Legislation and the Definition of a Firearm 25

2.1 History of Weapons Legislation in Britain 25

2.2 Legislation and Gun Control 26

2.3 Firearms and Crime 42

2.4 Firearms Consultative Committee 52

2.5 European Weapons Directive 54

2.5.1 CategoryA—Prohibited Firearms 54

2.5.2 Category B—Firearms Subject to Authorization 55

2.5.3 CategoryC—Firearms Subject to Declaration 55

2.5.4 CategoryD—Other Firearms 56

2.5.4.1 Single-Shot, Long Smooth-Bore Firearms 56

2.6 Legislation in the United States 58

Further Reading 62

3 Marks and Microscopy—The Emergence of a New Science: Firearms Manufacturing Processes and Their Implications Concerning the Daubert Challenge 65

3.1 The Pioneers 65

3.2 Experts and Charlatans—The American Experience 66

3.3 Court Battles—The English Experience 68

3.4 The Recent "Daubert Challenge" 71

3.5 Processes Used in the Manufacture of Firearms 72

3.5.1 Rifling of Barrels 72

3.5.2 Machining Processes 74

3.5.3 Finishing Processes 77

Further Reading 78

4 Mechanisms and Design Aspects of Firearms 81

4.1 Hinged Barrel Designs 81

4.2 Hammer Shotguns 81

4.3 Accidental Discharge 83

4.4 Repeating Arms 83

4.5 Magazine Systems 86

4.6 Bolt-Action Weapons 88

4.7 Lever-Action Rifles 88

4.8 Revolvers 89

4.9 Accident by Design, Manufacture, or Wear 89

4.10 Safety Catches and Internal Safeguards 92

4.11 Decocking Devices and Alternative Designs 95

4.12 Hazard Indicator Devices 97

4.13 Bolt-Action Rifle Safety Catches 98

4.14 Trigger Pulls 98

4.15 Blow-Back and Locked Breech Designs 101

4.16 Gas-Operated Arms 104

4.17 Gas and Air Weapon Designs 105

4.18 Crossbows 108

Further Reading 111

5 Internal Ballistics 113

5.1 Basic Principles 113

5.2 Efficiency of Energy Transfer 113

5.3 Powders and Pressures 116

5.4 Control of Powder Burning Rates 118

5.5 Drachms and Drams 121

5.6 Residues of Combustion 121

5.7 Primer Formulations 122

5.8 Gunshot Residue Analysis 124

5.9 Transfer of Marks to Missiles and Cartridge Cases 126

5.10 Microscopy of Air Weapon Missiles 130

5.11 Recoil and Barrel Flip 130

5.12 Choke Boring of Shotguns 132

5.13 Gauges and Bore Sizes 136

Further Reading 136

6 External Ballistics and Cartridge Loadings 137

6.1 Basic Principles 137

6.2 Bullet Stability and Instability 137

6.3 Bullet's Flight 138

6.4 Bullet Shape, Sectional Density, and Ballistic Coefficient 139

6.5 External Ballistics and Their Calculation 140

6.6 Accuracy 143

6.7 Fin and Aerodynamic Stabilization 145

6.8 Question of Range 147

6.9 Spent Bullet Myth 149

6.10 Secondary Ejecta 150

6.11 Behavior of Shotgun Cartridge Wadding 151

6.12 Sabot Loadings 152

6.13 Choke Boring—Shotgun Pellet Spread and Velocity 153

6.14 Pellet Deformation within the Bore 159

6.15 Choke Operation 162

6.16 Soft and Hard Shot—Shotgun Pellet Ballistics 163

6.17 Steel Shot Loadings 164

6.18 Alternative Non-Lead Materials 167

6.19 Pellet Sizes and Weights 170

6.20 The Propensity for Ricochet 172

6.21 Gunfire and the Sounds Made during the Flight of Missiles 175

Further Reading 180

7 Terminal/Wound Ballistics and Distance Firing 183

7.1 Mass, Momentum, and Kinetic Energy 184

7.2 Incidence of Ricochet 191

7.3 Consequences of Impact and Penetration 192

7.4 Armor-Piercing Ammunition 198

7.5 Explosive Anti-Armor Munitions 202

7.6 Ballistic Body Armor and Screening Materials 203

7.7 Shotgun Missile Injuries 207

7.8 Pistol Bullet Injuries and Expanding Bullets 211

7.9 High-Velocity Wound Effects 216

7.10 Range Determination of Single-Missile Injuries 226

Further Reading 230

8 The Scene of the Shooting Incident 233

8.1 On-Call Rota System 233

8.2 Arrival at the Scene 234

8.3 Scene Examination 234

8.3.1 Pathologist at the Scene 245

8.3.2 Roles 246

8.4 Initial Examination of the Body 246

8.4.1 Postmortem Examination 247

8.5 X-Ray Examination 248

8.6 First Samples and Observations 248

8.7 Wound Sites 250

8.8 Arrow and Crossbow Bolt Injuries 258

8.9 Blank-Operated Tool and Humane Killer Injuries 259

8.10 Wound Track 261

8.11 Examination of Postmortem Exhibits Back at the Laboratory 271

Further Reading 278

9 Examination of Exhibits at the Laboratory 281

9.1 Initial Examination of Firearms 283

9.2 Trigger Pulls and Mechanical Tests 287

9.3 Firing Range Tests 290

9.4 Incomplete, Defective, and Converted Arms 301

9.5 Recovery of Serial Marks 305

9.5.1 Iron and Steel 306

9.5.2 Aluminum Alloys 306

9.5.3 Copper, Brass, German Silver, and Other Copper Alloys 307

9.5.4 Stainless Steels 307

9.5.5 Plastics 307

9.6 Examination of Ammunition 307

9.7 Tear Gas and Irritant Loadings 310

9.8 Electric Shock Devices and Stun Guns 314

9.9 Recovered Cartridge Cases, Bullets, Pellets, and Wadding 318

9.10 Examination of Bullet- or Pellet-Damaged Items 327

9.11 Analysis of Bullets, Fragments, and Shotgun Pellets 330

9.12 Comparison Microscopy 334

9.13 Image Capture, Data Storage, and Computer Searches 348

9.14 Electron Microscope 352

9.15 Analysis of Firearms Discharge Residues 354

9.16 Laboratory Reference Collections 364

Further Reading 368

10 Presentation of Evidence to the Courts 373

10.1 Prosecution Witness 375

10.2 Defense Expert 385

Further Reading 387

11 Proof Marks and the Proof of Firearms 389

11.1 U.K. Proof Markings 396

11.1.1 Rules of Proof 2006 397

11.1.2 Under 1989 Rules of Proof 400

11.1.3 Under 1925 Rules of Proof 402

11.1.4 Under Rules of Proof before 1904 403

11.1.5 British Military Service Marks 406

11.2 Austrian Proof Marks 408

11.3 Belgian Proof Marks 408

11.4 Chilean Proof Marks 412

11.5 Czech Republic Proof Marks 412

11.6 French Proof Marks 413

11.6.1 Definitive Proof 414

11.6.2 Proof Marks Imposed on French Government Firearms 415

11.7 German Proof Marks 415

11.7.1 Marks of the Suhl Proof House 418

11.7.2 Early Proof and Other Marks Imposed on German Military Firearms from the Period of the Franco-Prussian War 418

11.8 Finnish Proof Marks 419

11.9 Hungarian Proof Marks 419

11.10 Italian Proof Marks 420

11.11 Spanish Proof Marks 422

11.12 Yugoslav Proof Marks 425

11.13 Russian Federation Proof Marks 426

11.14 Denmark Proof Marks 427

11.15 Austro-Hungarian Empire Proof Marks 427

11.16 India Proof Marks 429

11.16.1 Military Arms 429

11.16.2 Hunting Weapons 429

11.17 Israel Proof Marks 430

11.18 Australia Proof Marks 430

11.19 Irish Proof Marks 430

11.20 Swedish Proof Marks 431

11.21 Swiss Proof Marks 431

11.22 Slovak Republic Proof Marks 432

11.23 American Proof Marks 433

11.24 Choke Markings 433

Further Reading 434

Appendix 1 435

A1.1 Legal Expressions 435

A1.2 Useful Conversion Factors 438

A1.3 Approximate Densities of Some Pure Metals and Alloys 439

A1.4 Cyrillic Alphabet 439

A1.5 Arabic Numbers 439

Appendix 2 441

A2.1 Alphabetical Codes 441

A2.2 Number Codes 460

Index 463