Anatomy of a Bullet

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فهرست عناوین اصلی در این پاورپوینت

● Firearms
● Firearms: A Quick History
● Types of Firearms
● Ammunition
● Bullets
● Firearms Identification
● Forensic Firearms Expert
● Pulling the Trigger
● Bullet Caliber
● Bullet Anatomy
● Cartridge Parts & How it works
● Anatomy of a Bullet
● Bullet Comparisons
● Rifling
● Striae
● Class Characteristics
● Individual Characteristics
● Bullet Comparisons
● Cartridge Case
● Cartridge Markings
● Breech Marks
● Breech face Marks
● Actual Breech Marks
● Firing Pin Marks
● Chamber Marks
● Ejector Marks
● Extracting Pin & Ejector Marks
● Other Factors
● Shotguns
● Features of a Semiautomatic Handgun
● Firearms Evidence
● Gunshot Residue (GSR)
● Griess Test
● Results of GSR Hand Test
● GSR on the hand of a suicide victim, proving he was holding the weapon when it was fired.
● DANGER

GRAPHIC IMAGES!
● Contact Gunshot wound
● Abrasion Ring
● Entrance/Exit Wounds
● END
GRAPHIC
IMAGES!
● Trajectory
● SERIAL NUMBER RESTORATION
● FIREARMS EVIDENCE COLLECTION
● Toolmarks
● TOOL MARK IMPRESSIONS
● TOOL MARK IMPRESSIONS COLLECTION
● Matching Toolmarks
● Impressions
● Forensics: Debate

نوع زبان: انگلیسی حجم: 7.99 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 78 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/06/06 01:52:04

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

., bullet, mark, gun, barrel, cartridge, firearm, groove, pin, leave, caliber, case,

توجه: این مطلب در تاریخ 2019/06/06 01:52:04 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

https://1.cdn.edl.io/CbYC549h1AC8CRxYprsapSezGZj6D7P5bBpZ4baEkx7v31hO.ppt

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: ., bullet, mark, gun, barrel, cartridge, firearm, groove, pin, leave, caliber, case,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

firearms forensic analysis is vital to solve a crime that uses a gun. in ۲ ۴ there were ۱۲ homicides in the us the vast majority of u.s. homicides involve guns. and they are more powerful than ever. lansing state journal july ۲ ۷ firearms a quick history almost every gun is based on the same simple concept you apply explosive pressure behind a projectile to launch it down a barrel. the earliest simplest application of this idea is the cannon. the ۱st handheld guns were essentially mini cannons you loaded some gunpowder a steel ball lit a fuse war typically resulted in the need for improved weapons technology. in the late ۱۸ ’s the revolver quickly became popular due to it’s size quick loading. it only had to be reloaded every ۵ ۶ shots instead of after each shot. handguns reigned supreme for the past ۲ years to this day remain the most popular readily available firearm. types of firearms handguns pistols revolver semiautomatic rifles shotguns air or bb guns ammunition components cartridge case primer propellant projectile bullets made of lead sometimes jacketed with brass copper or steel bullet size—diameter caliber or gauge shapes firearms identification often confused with the term ballistics ballistics is the study of a projectile in motion. inside the firearm after it leaves the firearm when it impacts the target identification of firearms is based upon this basic idea a harder object marks a softer one imparts transfers its microscopic irregularities to that object. forensic firearms expert did a suspect use this gun to kill that person did these bullets come from that gun was it really self defense is this a case of suicide or is foul play involved bullet comparison weapons function is it safe has it been modified serial number restoration gunpowder residue detection on clothes hands wounds muzzle to target distances pulling the trigger pulling the trigger releases the firing pin… the firing pin strikes the primer… the primer ignites the gun powder… the powder generates gas that propels the bullet forward through the barrel ejects the spent cartridge case. how a revolver works youtube.wmv how a gun works youtube.wmv how a glock works youtube.wmv bullet caliber caliber the diameter of the gun barrel. caliber is recorded in hundredths of an inch .۲۲ .۳۸ millimeters ۹mm bullet anatomy cartridge parts how it works anatomy of a bullet bullet comparisons each gun leaves distinct markings on a bullet passing through it. a gun barrel is made from a solid bar of steel that has been drilled hallowed out. the drill leaves microscopic marks on the barrel’s inner surface. gun manufacturers also add spiral grooves to the barrel. this is known as rifling. lands the space between the grooves. as a spinning bullet passes through the barrel it is marked by these grooves. rifling the grooved spirals inside the barrel of a gun that produce lands and grooves on a bullet lands grooves are class characteristics striae scratches on a fired bullet like a barcode can serve as individual evidence matching bullets or bullet to a firearm class characteristics class characteristics once a manufacturer chooses a rifling process for a particular class of weapon they keep it consistent. lands grooves are the same for a model. .۳۲ caliber smith wesson has ۵ lands grooves twisting to the right. .۳۲ caliber colt has ۶ lands grooves twisting to the left. class characteristics can eliminate certain makes but are not enough to id a particular gun. individual characteristics imperfections in the manufacturing process make each barrel unique. rifled barrels even if made in succession will not have identical striation scratch like marks . bullet comparisons to match bullets to a gun test bullets must be fired through a suspect barrel for comparison. goddard comparison microscopes examined bullets side by side to match striated markings . cartridge case usually brass or nickel clad brass class evidence manufacturer shape caliber composition head stamps rimfire centerfire cartridges cartridge markings all moving components contact the cartridge rather than the bullet can leave useful impressions on shell cartridges. cartridge case individual characteristics breech face marks firing pin impressions chamber marks extractor marks ejector marks breech marks when a cartridge is fired the explosion forces the bullet down the barrel and the shell casing is forced back against the breech. this leaves impressions unique to the individual gun’s breech on the shell casing. breech face marks actual breech marks firing pin marks in order to fire the cartridge the primer must first be ignited. to accomplish this a firing pin strikes the center ring of the cartridge. this will in turn leave a distinct impression that is unique to the firing pin of that particular gun. firing pin marks chamber marks ejector marks extracting pin ejector marks the extracting pin and ejector throw the spent shell casing from the chamber of the gun. these leave marks on the shell casing that are unique to those parts on that particular firearm. other factors perfect matches sometimes difficult b c presence of grit rust in a barrel recovered bullets too mutilated or distorted on impact a spent bullet’s weight can sometimes determine the gun make. microgrooves ۸ ۲۴ grooves it’s not as common general rifling characteristics file fbi database of known land groove width for all weapons. shotguns smooth barrel projectile not marked as it passes through fire small lead balls or pellets contained within a shell. characterized by diameter of the shot size shape of the wad gauge diameter of the barrel  gauge  diameter identification can still be made by comparison of extractor ejector markings on shotgun shell. features of a semiautomatic handgun firearms evidence individual striae firing pin marks breech marks extractor marks ejector marks chamber marks class bullet type bullet caliber bullet weight lands and grooves rifling cartridge case head stamp gunshot residue gsr when a weapon is fired primer and propellant particles blow back toward the shooter. combustion products mostly no۲ unburned propellant and particles of lead follow the bullet spreading out with distance. gsr sources victim clothing or target shooter’s hands gunpowder chemistry major detectable …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: ., bullet, mark, gun, barrel, cartridge, firearm, groove, pin, leave, caliber, case,

این فایل پاورپوینت شامل 78 اسلاید و به زبان انگلیسی و حجم آن 7.99 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/06/06 01:52:04 استخراج شده است.

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