A Course of Instruction in Ordnance and Gunnery: Text |
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A Course of Instruction in Ordnance and Gunnery: Text (Classic Reprint) Henry Metcalfe No preview available - 2018 |
A Course of Instruction in Ordnance and Gunnery: Text (Classic Reprint) Henry Metcalfe No preview available - 2015 |
Common terms and phrases
ammunition angle armor artillery axis axle ballistic ballistic coefficient barrel block bolt bore breech breech-loading caliber cannon carriage cartridge cast cast iron cavity Chapter combustion compression constant construction corresponding curve cylinder determined detonation diameter diminished distance effect elastic limit employed energy equal Equation error explosion exterior feet figure fire front fuze gas check gases given grain groove gun-cotton gunpowder heat horizontal ignition impact inch increase iron jectile length loading mass maximum mealed powder mean measured metal method mold motion muzzle nitro-glycerine object operation parallax piece plane plate powder pressure principle projectile proportional radius range rear recoil resistance revolving rifle rotation screw screw thread sectional density shell shot shrapnel shrinkage sight small arms steel strain stress surface tangent target temperature tion trajectory trunnions tube variable vary velocity vertical volume weight wheels wrought iron
Popular passages
Page 10 - ... heads varied so little that it was plain that any of these forms most serviceable in other respects might be safely adopted. The slight variations in the resistances to the three latter forms lead to the conclusion that the amount of resistance offered by the air to the motion of elongated shot is little affected by the more or less pointed apex, but depends chiefly upon the form of the head near its junction with the cylindrical body of the shot. In this neighbourhood the forms of the hemispheroidal...
Page 1 - A tangential strain, tending to split the gun open longitudinally, and similar in its action to the force which bursts the hoops of a barrel ; '2. A longitudinal strain, tending to pull the gun apart in the direction of its length, which tendency is a maximum at the bottom of the bore, and diminishes to zero at the muzzle ; 3. A strain of compression exerted from the axis outward, tending to crush the truncated wedges of which a unit of...
Page 26 - ... gray iron, as before remarked, expands more and contracts less than other iron. The color and texture of cast iron depend greatly on the size of the casting and the rapidity of cooling; a small casting...
Page 4 - ... one-half of the required time, or time of passage of the projectile between the wires. To determine a formula for the time that it takes for one of the pendulums to pass over a given arc, let I be the length of the equivalent 'simple pendulum; v the velocity of center of oscillation or point M...
Page 1 - ... encountered. Ballistics. — That branch of applied mechanics which treats of the motion of projectiles. It is divided into two main branches — interior ballistics and exterior ballistics. The former is concerned with the motion of the projectile while in the gun, and the latter treats of the motion of the projectile after it has left the gun. Barrage fire. — Fire having for its purpose the placing of a curtain or barrier of fire, executed on predetermined firing data, across the probable...
Page 41 - The abscissa of the center of gravity of the area included between the axes OX and OS and the probability curve ABC, figure 29, is evidently the true mean error, x, or the arithmetical mean of an infinite number of errors.
Page 5 - Substituting for i/ its value in terms of a?, the above expression becomes : from which it is evident that the velocity of the pendulum increases from its highest to its lowest point. The time t' is equal to the circumference of the circle, the radius of which is /, divided by the velocity v ; if this value of t...
Page 19 - Fig. 14 shows a typical curve. The efficiency of the retraction geometry, at any rate with a hydraulic system, is the ratio of the area under the curve to that of the rectangle with maximum ordinates. This is because the jack must be designed for maximum peak loads and will be working at reduced pressure at other points of the travel. A high efficiency will give maximum retraction speed. It is possible to get retraction efficiencies of 70-80 per cent by very careful...
Page 1 - FIG. i. The line of sight is a straight line passing through the two sight points; in the act of firing, it also includes the target, as OT, Fig. 1. The line of departure is the line in which the projectile is moving when it leaves the gun; it is, therefore, the tangent at the muzzle of the gun to the curve described by the projectile, as OD. The axis of the bore is its geometrical axis, as OB.
Page 35 - ... different from that determined in the horizontal plane. A gun having a very flat trajectory is placed at a disadvantage when its accuracy is measured by the size of its probable rectangle in the horizontal plane; and, in general, the more nearly the plane of the target coincides with direction of the fall of the projectiles, the greater is this disadvantage.