Inhaltsangabe
This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1892. Not illustrated. Excerpt: ... CHAPTER 3 -- MEAN AND PRACTICAL TRAJECTORY. Distribution of Hits.--The deviations due to the causes discussed may in a single day's shooting tend more in one direction than in any other. For example, the wind on any given day may blow constantly from the left, throwing the shots more or less to the right; but the firer, in applying the wind-gauge to correct this, may make an excessive allowance, and thus throw the shots again to the left; and in action, where he is not informed of this error, he has no means of correcting it. Cone of Trajectories.--And when we consider a large number of shots, fired under varying conditions, the causes of deviation are as likely to act in one direction as in any other. Even if we consider only the errors due to the weapon and ammunition, we see that we cannot fire along any single trajectory, but that the shots in their flight form what may be considered a cone of trajectories, analogous to the jet of water from a hose, with a cross - section increasing with the distance from the origin. There is an imaginary curve which occupies a mean position among all these trajectories. It is called the mean trajectory, and is that which the projectile would probably have followed had the causes of deviation not existed. This mean trajectory is the one to which calculations are usually referred, aud is the trajectory worked out by Bashforth's tables. Practical Trajectory.--This mean trajectory gives the mean height of the bullets above the line of sight at any point of their flight, while the cone formed by the mean trajectory surrounded by the remaining trajectories allows us to calculate the chances of striking an object of given dimensions at a given range. This may be called the "practical trajectory," and is that which we must consider...
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