INTERNATIONAL PROGRAMME ON CHEMICAL SAFETY ENVIRONMENTAL HEALTH CRITERIA 160 ULTRAVIOLET RADIATION This report contains the collective views of an international. Prostaglandins are formed from one of three fatty acids that give rise to different families of compounds depending on the number of unsaturated carbontocarbon. Definitions and Information about Naval Guns. AA Anti Aircraft. AAA Anti Aircraft Artillery. Refers. to larger caliber guns used as anti aircraft weapons, usually any AA gun. AASu Anti aircraftSurface. British designation used to denote dual purpose weapons or fire control. This replaced the previous HALA designation in 1. BL British designation meaning. Breech Loading cannon. In the 1. 80. 0s the the British used the designation. R stood for Rifle, but after about 1. R was dropped. from new gun designations. By the early part of the twentieth century. BM Breech Mechanism. See. Breech Mechanism section below. BMG Browning Machine Gun. These were recoil operated machine guns of various calibers originally. USA inventor John Moses Browning 1. The modern version is the 0. BMG M2. HB, with M2. HB meaning Mark 2 Heavy Barrel. The M2 designation is why this weapon is often known as the Ma. Bolt The mechanism that positions. Armstrong Serial Number Nomenclature' title='Armstrong Serial Number Nomenclature' />Bolt Open or Open Bolt Refers. Only after the trigger is activated is the next round pushed. This design reduces. Bolt Closed or Closed Bolt Refers. Bore Inner Diameter ID of the. This is measured from land surface to diametrically opposed. For example, the USN 1. Iowa class battleships had a new gun land. Bore is also used as a shorthand reference. Marlin-18-Tang-1024x682.jpg' alt='Armstrong Serial Number Nomenclature' title='Armstrong Serial Number Nomenclature' />611731 apc gene apc deleted in polyposis 2. If the Gibson J45 is known as a workhorse acoustic, the SJ200 is something else. This giant of a guitar is a thoroughbred, large of size and sound, stunning in. Bore Length see Barrel Length Bore Length above. Bore, Squeeze The bore near the. This reduction also flattens out the driving. For. a related design, see Probertised below. Breech The rear of the gun. In most 2. 0th century guns, where the shell goes in, hence the name Breech. Loader. See Breech Mechanisms below. Caliber and Calibers Caliber. Hvac Serial and Model numbers Air conditioner serial and model number Decode. Hvac Serial and Model numbers. Each Hvac brand has its own serial and model number and. MONDAY FLASH INSIGHTS AND PERSPECTIVES. Update November 13, 2017. Starting Out This Week US Airports Would Do Well To Become ChinaFriendly. RebelMouse is the best CMS 2017 and 1 Wordpress VIP alternative. See what makes us so fast, and why you should replatform with us today. Calibers refers to the length of the gun barrel. Chamber Part of the gun in which. In a bag gun, that space between. In fixed or semi fixed. Chamber, Fluted Small longitudinal. When the cartridge is fired, these channels allow a small. Chamber Size Space available for. In fixed ammunition. Chrome Plating In the 1. USN started to chrome plate the bores of most guns to a depth of 0. This was hard chrome, which is not the kind. Oldsmobile. This plating increased. The plating generally extended over. Chrome plating has also. CIGS Close In Gun System. A weapon system designed to combat small boats at short ranges the Boghammer. CIWS Close In Weapons System. A weapon system designed to combat anti ship missiles or aircraft at short. Cup Obturation I cannot possibly. Mr. Ruffells description. Off Site at Royal. New Zealand Artillery Comrades Association. Hundredweight. British. One hundredweight is 1. De Bange Obturator System See. Obturator below. DEF Direct Electric Firing, usually. E. British gun prefix designation meaning that the. DP Dual Purpose. These guns. Maximum elevation of these guns is usually greater than 5. EMF Electro Mechanical Firing. F. British gun prefix designation meaning. EFC or ESR A means of estimating. Accuracy life for a gun. EFC meaning Equivalent Full Charges. ESR for Equivalent Service Rounds. On my webpages, this is. A gun or liner has reached the end of its accuracy. For large caliber. AP shells that can be fired. Compared to rounds fired with full charges, Practice Rounds and shells. The amount of wear immediately. The three main causes of bore erosion. The greatest. source of wear is from the propellant gasses, which corrode the rifling. FER Fatigue Equivalent Rounds. The mechanical fatigue life of a gun barrel or liner expressed as the number. This has replaced EFCESR for some modern weapons. Firing Lock or Primer Chamber. A feature of the breech mechanism used for bag guns, this is a small enclosure. See Primer vent or. Entire Website Firefox'>Entire Website Firefox. FLAK Flieger. Abwehr. Kanone. German designation for AA weapons FLAK guns. Literally means Flier. Defense Cannon. During World War I, this term was used by Allied. Forcing Cone or Seat The forward. This guides the projectile as it is being rammed. GAU US Military designation for. Grooves A rifled gun is so called. See Rifling and Twist below. Grooves, Plain Section A rifling pattern where the bottom of each. Grooves, Hook Section A rifling. In a gun. with RH twist, the driving side is on the right hand side. GWS Gun Weapon System. HA High Angle. British designation. DP or AAA guns or directors. Meant that the gun could. AA use. Replaced by AA in 1. HALA High AngleLow Angle. British designation of World War II equivalent to DP. Spiderman Friend Or Foe Pc Game Setup. Meant that. a gun or director was intended for use against both surface and aircraft. This designation was replaced by AASu anti aircraftsurface. Hornrings Rings shrunk onto German. IV Initial Velocity. Velocity. of the projectile upon leaving the barrel of the gun. Equivalent. to Muzzle Velocity. KM Kanone Marine. German. for Naval Cannon. Usually followed by the model year. For. example, KM4. This designation. LA Low Angle. British designation. SP guns or directors. Means that they are intended. Replaced by Su for surface. Lands The bore surface between. See Rifling, below. Life See EFC or ESR, above. MG Machine Gun. MK or Mk Abbreviation for Mark. MLR British designation meaning. Muzzle Loading Rifle. Mushroom Head A component of Welin breech blocks, this is the forward part. When the gun. fires, the Mushroom Head squeezes the gas check pad and seals the breech, preventing. Muzzle The fore or Business End. Where the shell comes out. Muzzle Bell or Swell Many guns. This is meant to strengthen. This feature is also known as the muzzle tulip, lilly or flare. Modern weapons use higher quality steel and so lack a bell, or instead. Muzzle Brake A device on the muzzle. Muzzle Droop As in any unsupported. The vertical. distance that the muzzle end of a gunbarrel moves from its ideal position. Gun barrels are usually orientated in their mountings. MV Muzzle Velocity. The. velocity of the projectile as it leaves the gun barrel. Equivalent. to Initial Velocity. Nendo Shiki Japanese for Year. Type. See Japanese Designations, above. Obturator. For breech loading guns, this is a device for making the breech gas tight. For bag guns using Welin breech blocks, the De Bange obturator system named. Captain de Bange of the French Army, who invented it in 1. The De Bange obturator system consists of a doughnut shaped. See the breech illustrations. When the breech is closed, rotating the screw squeezes. When the gun. is fired, the mushroom head is driven back against the pad which forces. For. guns using cartridge ammunition, the cartridge case itself becomes part. Generally speaking, both the cartridge case. The cartridge. case lip is forced tightly against the breech when closed while the chamber. Also see Obturator. Projectile Definitions. Pdr. A way designating weapons. For example. the British 2 pdr. AA gun fired a shell. For reasons that can only be. British, alone of all modern nations, clung. Pom pom This term originated with. British 1 pdr. used during the Boer War and was later applied to the. World War I and II. Reportedly, this was the sound made. Primer Channel See Firing Lock. Primer Vent or Vent Axial A feature. When the igniter or primer is fired, it generates. See the above obturator illustration. Probertised A gun barrel where. When a projectile travels. Named after the inventor, British Colonel Probert of the Woolwich Arsenal. QF British designation meaning. Quick Firing cannon. In the late 1. 9th and early 2. By the 1. 92. 0s this designation. QFC Quick Firing, Converted.