Muzzle

The Majac jet pulverizer (Ho.sokawa Micron Powder Sy.stems Div.) is an opposed-jet type with a mechanical classifier (Fig. 20-55). Fineness is controlled primarily by the classifier speed and the amount of fan air dehvered to the classifier, but other effects can be achieved by variation of nozzle pressure, distance between the muzzles of the gun barrels, and position of the classifier disk. These pulverizers are available in 30 sizes, operated on quantities of compressed air ranging from approximately 0.6 to 13.0 mVmin (20 to 4500 ftV min). In most apphcations, the economics of the use of this type of jet pulverizer becomes attractive in the range of 98 percent through 200 mesh or finer. 

Weight. The projectile weight must be compatible with the desired muzzle velocity. The greatest challenge is usually to make the projectile as light as possible to achieve a maximum impact velocity, yet meet other criteria such as tilt and integrity. 

Gun powders/propcl hints Muzzle blast Recoilless rifle blast Exploding sparks Exploding wires Laser sparks Contained explosions ... 

Miindung,/. mouth opening, aperture, orifice, etc. muzzle (of a gun) terminus (of a railway). 

MC (Poudre). BkPdr used in Fr as propellant for muzzle loading cannons and as a bursting charge in projectiles Ref Daniel (1902), 427... 

Muzzle. The end of the barrel of a gun from which the bullet or projectile emerges Ref OrdTechTerm (1962), 199-R... 

Muzzle Brake. (Freins de bouche in Fr, M lin-dungsbremse in Ger). A cylindrical device with flanged or baffled surfaces which is attached to the muzzle of a gun, usually by threads, to offset a long or complete recoil of the gun when fired. The expanding proplnt gases strike the baffles, thus pushing the gun barrel forward. This action can shorten the actual recoil distance, or it may relieve an overloaded recoil system. The latter would occur when a conventional gun was deliberately overloaded to increase the projectile velocity... 

Muzzle Flash or Muzzle Flame. Flame that appears at the muzzle of a gun when a projectile leaves the barrel. See Flash Reducing (or Antiflash) Agents, Flash Reduction in Ger Projectiles, and Flash Reduction in Ger Proplnts, Vol 6, F96-L to F99-L... 

Muzzle Velocity (MV, Initial Velocity). The velocity at which a projectile leaves the muzzle of a gun, expressed either in m/sec or ft/sec. The moment the projectile emerges from the bore, its velocity starts to decrease because of air resistance. For this reason, the muzzle velocity is considered as the max velocity of a... 

Muzzle velocities may either be calcd by means of equations, such as that of LeDuc (Ref 1, p 74) or detd experimentally thru use of chronographs (Refs 4 5)... 

Neck. Cylindrical portion of cartridge case between mouth and shoulder (Ref 1). The part of a cannon immediately behind the swell of the muzzle (Ref 2)... 

These propints gave very satisfactory performance. They developed a muzzle velocity of 1640 ft/sec and a press of 1750 atm, when used in 84cm field guns with a 600g charge and a 6.7kg projectile. In the 7.5mm rifle, with a 2g charge and a I3.8g bullet, a muzzle velocity of 2035 ft/sec and a press of 2200 atm were attained Refs 1) P.G. Sanford, Nitroexplosives , London (1896), 186-7 2) Daniel (1902), 584... 

A device incorporated in a projectile to make the tube of a weapon gas-tight, preventing escape of gas until the projectile has left the muzzle Ref OrdTechTerm (1962), 207-R... 

It fired an 18-inch finned projectile weighing 6 lbs at a muzzle velocity of 1700 fps to an effective range of 700 meters. The projectile penetrated 140mm of armor at a 60° angle of impact... 

Parrott Gun. A type of muzzle-loading cast-iron rifled gun with a wrought-iron band shrunk... 

Patch. A piece of greased cloth or leather which was wrapped around the ball to make it fit the bore more tightly. It was commonly used with muzzle-loading rifles that fired spherical balls, and in some dueling pistols... 

Computed Maximum Pressure (CMP). Value of max pressure computed by means of interior ballistic formulas. It will be developed when a new gun of a particular type is fired under standard conditions with a propelling charge which will give to the projectile its rated muzzle velocity Rated Maximum Pressure (RMP). Value of max pressure specified in the proplnt specifications as the upper limit of avg pressure which may be developed by an acceptable proplnt in the form of propelling charges which will impart the specified muzzle velocity to the specified projectile. Normally about 2000psi.above the computed max pressure, subject to determination at the time of development... 

Rated Maximum Pressure (RMP). The gas pressure which should not be exceeded by the avg of the max pressures developed by a group of firings which will impart the specified muzzle velocity to the specified projectile. If the RMP... 

LD50 values for the dermal route of exposure to methyl parathion have been established in acute studies for rats 67 mg/kg for males and females (Gaines 1960), 110 mg/kg for males, and 120 mg/kg for females (EPA 1978e). The LD50 in male mice exposed by dermal application of methyl parathion to their hind feet (rather than shaved backs) was 1,200 mg/kg (Skinner and Kilgore 1982a). The mice were muzzled to prevent oral exposure from grooming. 

Mice that were exposed dermally to residues of methyl parathion in emulsifiable concentrate on foliage, and were muzzled to prevent oral intake, developed inhibition of plasma cholinesterase and erythrocyte cholinesterase after two 10-hour exposures (Skinner and Kilgore 1982b). For the organophosphate pesticides tested in this study, cholinergic signs generally were seen in mice with cholinesterase inhibition >50% results for this end point were not broken down by pesticide. 

Type/Gauge Distance from Velocity (m s- ) Penetration Muzzle Impact... 

Ordnance propellants are required to give the minimum of muzzle flash, smoke and barrel erosion. All these objectives are assisted by adding to the propellant a proportion of nitroguanidine (picrite), made by treating guanidine nitrate with sulphuric acid and brought to very fine particle size by recrystallisation and disintegration. 

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