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Firearm Sound Suppression
Firearm Sound Suppression Nature and Measuring of Firearm Sounds Philip H. Dater, MD Instructor, LMO Training, Henderson, NV ©2014 P. Dater Antares Technologies, Inc Nature of Sound • Air in motion • Pressure variation the human ear can detect • Pressures measured in Pascals* • Threshold of human hearing: 20 µPascals (0 dB) • Sound is a form of overpressure *NOTE: 1 PSI = 6895 Pascal Decibels (Db) • Pressures in Pascals are unwieldy numbers • Decibels are a ratio of pressures (named after Alexander Graham Bell) dB = 10(log10(P1/P0)) where P0 is the reference pressure (20 µPa) and P1 is the measured pressure Example: doubling (or halving) of the pressure is a 3 dB change, changing the pressure by a factor of 10 is a 10 dB change or a factor of 100 a 20 dB change If 1 PSI = 6895 Pascal. How many PSI overpressure is a 170 dB gunshot? Firearm Sound Sources Firearm sound generated by 1. Sudden release of hot, high pressure propelling gases in bore, and 2. Sound of bullet in flight (ballistic crack/sonic boom) which is generated outside the weapon system and cannot be addressed by a suppressor Firearm Sound Character Sound diminishes by inverse square law as observer moves away from source. Each doubling of distance reduces sound level by 6 dB. How Loud are the Weapons? P229 .357 SIG 162-163 dB P229 .40 S&W 161-162 dB P228 9mm 159-162 dB AR15 .223 162-163 dB (164 db M4) (All measured 1 meter to the left of the muzzle) Maximum Safe Sound Levels Maximum permissible sound exposure before hearing protection is required: • Steady Sound (OSHA) : 85 dB work environment (40 hr/week, 52 wk/year) • Peak Firearm sound (MIL-STD-1474D) : 140 dB (Assuming no other excessive exposure) Firearms and Hearing Damage • Hearing damage is dose related and cumulative. -
Contact Mankato Police Department (507) 387-8780 Stolen Firearms Mankato, MN National Guard Armory Burglary 12/1/2010 ICR #10-33708
Stolen Firearms Mankato, MN National Guard Armory Burglary 12/1/2010 ICR #10-33708 Manufacturer Type Model Cal./Ga. SN/OAN Notes/Markings/Addn'tl Description/Info Allen Pepperbox 4 shot percusion .36 cal 421 pepperbox Allen & Thurber Pepperbox Pepperbox .34 403 5 shot Allen & Thurber 6 shot .36 cal 634 Allen & Thurber Rifle .38 Centerfire Extra Long NONE Am. Standard Tool Co. Revolver Rim-Fire .22 43704 7 shot Bacon Arms Co Pepperbox Cartridge Pepperbox .22 cal rim-fire NONE Barber & LeFever Shotgun 10 ga 5165 cased, Double barrel C. Sharpe Pepperbox Pepperbox No. 1 .22 cal rim-fire 1333 Colt Rifle Lightning .22 rim-fire 52525 Colt Revolver Pocket 1849 .31 248530 6 shot single action Colt Revolver Army .32-20 51157 Double action Colt Rifle Lightning .32-30 W.C.F or .32 C.L.M.R. 7556 Colt Revolver ? Store Keepers .33 42310 Lightning double action Colt Revolver Navy 1851 .36 73608 6 shot single action Colt Revolver Navy 1851 .36 174324 6 shot single action Colt Semi-auto 1911 Govt .45 C175688 Grips carved in Japanese Style Colt Revolver Old Line .22 cal 7 shot rim-fire 20375 high hammer variation, single action Colt Pistol Root Model .28 cal 5 shot 3782 Colt Pistol New Police Model of 1862 .36 cal, 5 shot 18319 single action Colt Pistol Navy Model of 1861 .36 cal, 6 shot 7774 single action Colt Derringer No 3 Derringer .41 cal rim fire 2330 Colt Pistol Army Model of 1860 .44 cal , 6 shot 62837 single action Colt Pistol Army Frontier Model of 1878 .45 cal, 6 shot 674 Continental Arms Co. -
Voices of the Past
Voices of the Past Part of the Army Heritage Center Foundation’s Educational Series CIVIL WAR Answering the Call: The Personal Highlights: Equipment of a Civil War Soldier • Civil War Soldiers (United States, 1861-1865) carried fifty pounds or The Union Army in the Civil War had a more of equipment distinct advantage over the necessary to travel, Confederacy when it came to camp, and fight. equipment. The North had more factories to produce supplies, more • Over time Soldiers people to work in the factories, and would discard more railroads to deliver the supplies unnecessary to the Soldiers. In the end, the North’s equipment to lessen their loads. industrial might played an important factor in the Confederate defeat. • Union Soldiers usually had better equipment For a Soldier, equipment is a matter of than their Confederate survival. Even something as simple as counterparts. a button can make the difference between victory and defeat if it fails to • Confederate Soldiers function properly at the wrong time. acquired Union For this reason Soldiers have a strong equipment whenever tendency to become attached to they could. equipment they like, and to modify or discard equipment they find unreliable Union Soldier in full field gear. or useless. Among the Infantry, who Image Courtesy of the Center of have to carry their equipment Military History. wherever they go, this tendency is even stronger. to a great deal of variation in equipment and uniforms. As the war Soldiers must carry everything they progressed, uniforms and equipment need for combat operations with them became more standardized in order to at all times. -
Archeological Findings of the Battle of Apache Pass, Fort Bowie National Historic Site Non-Sensitive Version
National Park Service U.S. Department of the Interior Resource Stewardship and Science Archeological Findings of the Battle of Apache Pass, Fort Bowie National Historic Site Non-Sensitive Version Natural Resource Report NPS/FOBO/NRR—2016/1361 ON THIS PAGE Photograph (looking southeast) of Section K, Southeast First Fort Hill, where many cannonball fragments were recorded. Photograph courtesy National Park Service. ON THE COVER Top photograph, taken by William Bell, shows Apache Pass and the battle site in 1867 (courtesy of William A. Bell Photographs Collection, #10027488, History Colorado). Center photograph shows the breastworks as digitized from close range photogrammatic orthophoto (courtesy NPS SOAR Office). Lower photograph shows intact cannonball found in Section A. Photograph courtesy National Park Service. Archeological Findings of the Battle of Apache Pass, Fort Bowie National Historic Site Non-sensitive Version Natural Resource Report NPS/FOBO/NRR—2016/1361 Larry Ludwig National Park Service Fort Bowie National Historic Site 3327 Old Fort Bowie Road Bowie, AZ 85605 December 2016 U.S. Department of the Interior National Park Service Natural Resource Stewardship and Science Fort Collins, Colorado The National Park Service, Natural Resource Stewardship and Science office in Fort Collins, Colorado, publishes a range of reports that address natural resource topics. These reports are of interest and applicability to a broad audience in the National Park Service and others in natural resource management, including scientists, conservation and environmental constituencies, and the public. The Natural Resource Report Series is used to disseminate comprehensive information and analysis about natural resources and related topics concerning lands managed by the National Park Service. -
19Th Century Carbine Manual.Indd
National Park Service Manual of Instruction for the Safe Use of Reproduction Breech-Loading Carbine and Rifl e in Interpretive Demonstrations TABLE OF CONTENTS Page Part I: Introduction 1 Part II: Nomenclature 5 Part III: Inspection and Maintenance 7 Part IV: Drill 10 Part V: Misfi re Procedures 27 Part VI: Laboratory 29 Part VII: Demonstration Critique 31 4 PART I - INTRODUCTION This manual sets forth the procedures that must be followed by persons demonstrating single-shot breechloading carbines and rifl es to the public in areas administered by the National Park Service (NPS). It also provides instruction on proper maintenance, inspection, and repair procedures. This manual must be used in conjunction with the service wide standards for Historic Weapons Firing Demonstrations (NPS-6 Guidelines for Interpretation). The information below largely comes from primary sources of the period during which the weapons described were used. Several generations of NPS historic weapons personnel have modifi ed these original texts in order to improve demonstrator and visitor safety, make the original texts more comprehensible and to incorporate knowledge gained from years of actually using these weapons in the fi eld. The Park’s Certifi ed Historic Weapons Program Supervisor is responsible for the training and safety of the demonstrators, as well as the safety of the visitors. The following criteria will help determine when a demonstrator has been adequately trained. 1 THE SHARPS CARBINE This manual mainly deals with the use and care of reproduction Model 1859 and Model 1863 Sharps carbines, which were the predominant carbine used during the American Civil War and are by far the most popular reprodction cavalry arm used today. -
Gun Machine Pdf, Epub, Ebook
GUN MACHINE PDF, EPUB, EBOOK Warren Ellis | 320 pages | 16 Jan 2014 | Hodder & Stoughton General Division | 9781444730661 | English | London, United Kingdom Gun Machine PDF Book The first handheld guns were essentially miniature cannons; you loaded some gunpowder and a steel ball, then lit a fuse. Try another? Features Bullet Hell shooter Over 40 gun types Skill upgrades to suit your playstyle Epic set-piece boss battles Unique 2D art style Monster closet combat puzzles Hand crafted, consistent experience. See more gun pictures. Semi Auto Everybody's favorite Marine gunner is back. Ballistic Background: Barrel. Table type. Precision simple table type. See all. Learn More in these related Britannica articles:. Machine Gun Preacher. Instead, the forward gas pressure pushes the bolt back. Home Technology Engineering Mechanical Engineering. Lots More Information. You can write your own review for this product to share your experience with the community. The first fully automatic machine gun is actually credited to an American named Hiram Maxim. Popular user-defined tags for this product:? Applications of thin wall deep hole drilling. The gas system is similar to the blowback system, but it has some additional pieces. Hiram Stevens Maxim of the United States was the first inventor to incorporate this effect in a weapon design. The gun would continue to fire until the operator stopped pressing the trigger or the gun finally ran out of ammunition. Get exclusive access to content from our First Edition with your subscription. The hopper system was replaced by the belt-fed system , which helps control the ammunition's movement into the gun. -
Instruction Manual for Muzzle Loading Rifles, Pistols and Shotguns
INSTRUCTION MANUAL FOR MUZZLE LOADING RIFLES, PISTOLS AND SHOTGUNS - Edition 01.2021- Warnings pag. 2 Black powder pag. 4 Maximum combinations of propellant and projectile for Inverstarm muzzle loading firearms pag. 5 Loading the muzzle loading firearms: pag. 6 - Loading the patched round ball pag. 7 - Loading the maxi ball and minie ball pag. 7 - Loading the shot pag. 8 - Safety notes pag. 9 Cleaning pag. 11 INVESTARM MUZZLE LOADING FIREARMS ARE INTENDED ONLY FOR THE EXPERIENCED SHOOTER INVESTARM MUZZLE LOADING FIREARMS MUST BE LOADED ONLY WITH BLACK POWDER REPAIRS OF INVESTARM MUZZLE LOADING FIREARMS MUST BE DONE ONLY BY A INVESTARM AUTHORIZED SERVICE CENTER THIS INSTRUCTION MANUAL CONTAIN IMPORTANT WARNINGS WHITH SHOULD BE UNDERSTOOD BEFORE USING THIS FIREARM THIS INSTRUCTION MANUAL SHOULD ALWAYS ACCOMPANY THIS FIREARM AND BE TRANSFERRED WITH IT UPON CHANGE OF OWNERSHIP. COPY OF THIS MANUAL IS AVAILABLE AT INVESTARM ON REQUEST, OR ON THE WEBSITE WWW.INVESTARM.IT Pag. 1 INVSTARM SRL Via Zanardelli, 210 - 25060 Marcheno (BS) Italia [email protected] – www.investarm.it - Telefono (+39) 030 8960105 - Fax (+39) 030 861285 P.iva 00565130986 - CF 00467520177 - Capitale Sociale € 105.000,00 i.v. - Reg. Imprese Brescia 00467520177 WARNINGS 1. All Investarm black powder rifles, shotguns and pistols are intended for use with black powder only. Use of any other propellant may cause serious injury to the shooter and damage to the firearm. Never use smokeless powder. 2. Guard against overcharges. Follow the instructions and do not exceed maximum charges stated in this instruction manual. Use an adjustable powder measure of non-sparking brass for a safe and accurate charge measurement. -
Manual of Instruction for the Safe Use of Reproduction Nineteenth Century Percussion Revolvers
National Park Service Manual of Instruction for the Safe Use of Reproduction Nineteenth Century Percussion Revolvers 1 2 TABLE OF CONTENTS Page Part I: Introduction 1 Part II: Nomenclature 2 Part III: Inspection and Maintenance 4 Part IV: Revolver Drill (Dismounted) 9 Part V: Misfi re Procedures 21 Part VI: Laboratory 23 Part VII: Demonstration Checklist 25 Bibliography 26 3 4 PART I - INTRODUCTION This manual sets forth the procedures that must be followed by persons demonstrating 19th century percussion revolvers to the public in areas administered by the National Park Service (NPS). It also provides instruction on proper maintenance, inspection, and repair procedures. This manual must be used in conjunction with the service wide standards for Historic Weapons Firing Demonstrations (NPS-6 Guidelines for Interpretation). The information below largely comes from primary sources of the period during which the weapons described were used. Several generations of NPS historic weapons personnel have modifi ed these original texts in order to improve demonstrator and visitor safety, make the original texts more comprehensible and to incorporate knowledge gained from years of actually using these weapons in the fi eld. The Park’s Certifi ed Historic Weapons Firing Demonstration Supervisor is responsible for the training and safety of the demonstrators, as well as the safety of the visitors. The following criteria will help determine when a demonstrator has been adequately trained. 1 PART II - NOMENCLATURE Exploded View, Colt Revolver Barrel with front sight and loading lever catch. Cylinder with two cones unscrewed. 2 Loading lever screw; Barrel wedge Loading lever assembly with latch and plunger. -
Muzzleloading Communications Officer Sam Talbot Steps Back in Time for the Latest Challenge As He Continues His Quest to Shoot the SSAA Disciplines
Talbot on target! Muzzleloading Communications Officer Sam Talbot steps back in time for the latest challenge as he continues his quest to shoot the SSAA disciplines. f I’ve learned one thing from shooting the SSAA disciplines it’s that so much of the sport is steeped in history. For I centuries firearms were loaded from the muzzle end so it’s fitting the SSAA has the Muzzleloading discipline to celebrate this unique practice and the many firearms which use this method. So like countless shooters before me, this month I too loaded a firearm from the unconventional end and learned about the many ingenious ignition systems that were dreamt up along the way. How does it work? Muzzleloading caters to the original and replica rifles, muskets, handguns and shotguns used during Australia’s colonial days, the firearm categories very detailed with each having its own classes and subsections. Rifle events are shot from the offhand, cross-sticks/prone, benchrest and sometimes kneeling/sitting positions, while shotguns are shot around stations placed various distances from the thrower. In addition to range shooting, Muzzleloading shooters are often enthusiastic followers of historical events and re-enactments. Lots of different firearms can be used in Muzzleloading including rifles, muskets, shotguns, revolvers and pistols. In fact, anyone looking to compete in all available Muzzleloading events in all categories would have to shoot more than 30 and need several different firearms. National discipline chairman Kim Atkinson told me it’s the firearms which set Muzzleloading apart from other disciplines. “You’re using genuine or replica firearms from the 1800s as well as black powder single-shot cartridge rifles from the 1890s,” he said. -
Safety Notes for Firing Percussion Muskets
THE AMERICAN CIVIL WAR SOCIETY LTD SAFETY NOTES FOR FIRING PERCUSSION MUSKETS ‘Drill is the rock foundation of all discipline, without which no body of troops can train or fight’ Field Marshall B L Montgomery. 1. Follow the drills for the weapon as per Drill Manual, be it Federal or Confederate. 2. When firing at battle re-enactments, ONLY put gunpowder down the barrel (no paper, noth- ing else, when re-enacting). When you bite your paper cartridge pour the gunpowder down the barrel and then put the empty paper tube in your pocket or the front of your jacket to avoid lit- tering. Authentic drill & firing displays can vary this, when you are not firing at or towards anyone. 3. Never actually aim at anyone, but always aim slightly off ‘or up’. Never fire your musket with black powder in it at any human being when that person or body of troops is closer to you than 15 metres. Never fire your musket at horses/cavalry when they are closer to you than 25 metres. 4. Muskets may be fired when in Skirmish order i.e. spread out, but only when you are in the ‘front rank’. Muskets may be fired by Sentries or others on patrol, but only subject to the above safety key rules. 5. Only ever use your weapons when on and at a re-enactment and participating in your Societ- ies contracted re-enactment or training event. When travelling to and from home/the re-enact- ment, always make sure your weapons (including swords and bayonets) are well covered, out of sight in your vehicle, preferably locked in the boot. -
Modern Use of Percussion Revolvers and Cartridge Conversions
Page 1 JANUARY 2021 Columns & News The GunNews is the official monthly publication of the Washington 3 Legislation & Politics–Joe Waldron Arms Collectors, an NRA-affiliated organization, P.O. Box 400, Sumner, 6 Straight From the Holster–JT Hilsendeger WA 98390. Subscription is by membership only and $15 per year 23 Short Rounds of membership dues goes for subscription to the magazine. 24 Interview with a Gunsmith–Tom Burke Features Managing Editor–Philip Shave 8 American Percussion Revolvers–Dick Send editorial correspondence, Wanted Dead or Farnsworth Alive ads, or commercial advertising inquiries to: 16 Shooting Those C&R's–Ray Heltsley [email protected] 7625 78th Loop NW, Olympia, WA 98502 For Collectors (360) 866-8478 26 Wanted: Dead or Alive Assistant Editor–Bill Burris 32 Show Calendar Art Director/Covers–Bill Hunt Copy Editors–Bob Brittle, Bill Burris, Forbes Cover–Some of Freeburg, Woody Mathews Member Resources the loading tools 5 Board Minutes that are useful 31 Renewal forms in loading for CONTACT THE BUSINESS OFFICE FOR: obsolete car- tridges. Ray n MISSING GunNews & DELIVERY PROBLEMS Heltley photo. n TABLE RESERVATIONS n CHANGE OF ADDRESS n TRAINING n CLUB INFORMATION, MEMBERSHIP Club Officers President — Bill Burris (425) 255-8410 (425) 255-8410 voice Vice President — Boyd Kneeland (425) 643-9288 Office Phone Hours: 9a.m.–5p.m., M–TH Secretary — Forbes Freeburg (425) 255-8410 closed holidays Treasurer — Holly Henson (425) 255-8410 Immediate Past President — Boyd Kneeland (425) 643-9288 There is no physical office–staff may be reached by phone or email. Club Board of Directors Scott Bramhall (425)255-8410 John Hubbard (425) 255-8410 SEND OFFICE CORRESPONDENCE TO: Bill Palmer (425) 255-8410 Richard Ripley (206) 271-0670 P.O. -
Download PDF File
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