## The Groundwork of Practical Naval Gunnery: A Study of the Principles and Practice of Exterior Ballistics, as Applied to Naval Gunnery, and of the Computation and Use of Ballistic and Range Tables |

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12 knots angle of departure angle of elevation angle of fall ANSWERS apparent wind approximation armor atmospheric conditions axis ballistic coefficient Ballistic Tables calibration cent change in range CHAPTER coefficient of form colog Column 12 compute the value correction circle corresponding cos2 curve danger space deflection scale density distance equation error in range Figure firing ship flight foot-seconds formula given range hits Ingalls initial velocity integral line of fire loglog maximum ordinate Mayevski's mean deviation mean dispersion mean errors mean point method Motion of gun plane curve point of fall point of impact pounds powder probability projectile pseudo velocity radial arm range in feet range in yards range table real wind remaining velocity resistance ship short speed circle standard conditions standard problem 12 striking velocity telescopic sight temperature tion trajectory in air traverse tables variation from standard Variation in range vertex yards due

### Popular passages

Page 23 - The angle of fall is the angle between the tangent to the trajectory at the point of fall and the horizontal plane.

Page 22 - 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.

Page 245 - Ans. \\. 2. A bag contains three red, four white, and five black balls. Required the probability of drawing two red balls in two drawings, the ball first drawn not being replaced before the second trial ? 3. Each student in a class of twenty is likely to solve one problem out of every eight. What...

Page 33 - A body is projected, from the top of a tower, 200 feet high, with a velocity of 50...

Page 33 - Obtain a quadratic equation for determining the range on the horizontal plane through the foot of the tower.

Page 151 - ... 5. To give the direction to the piece. 6. To give the elevation in direct laying. 7. To call ready. 8. To move his head out of the way of the sight before the piece is fired. 9. To give the command to fire the piece. 10. To measure a deflection. The Deflection. 846. The deflection is the horizontal angle between the line of sight and the axis of the bore.

Page 55 - From (35) we see that the angle of fall is always greater than the angle of departure, but can never reach double the latter.* 82.

Page 243 - Knowing the mean lateral deviation (yz ) of a gun, to find the probability of a shot striking within the distance a to right or left of the mean point of impact, it is only necessary to take from the table the value of P which corresponds to the argument — . And so, too, the probability of a shot striking...

Page 244 - ... the error, or deviation, which is just as likely to be exceeded as it is not to be exceeded. If we wish to find the probability of hitting an area whose width is 2b and whose height is 2h, since the lateral and vertical deviations are independent of one another, the probability is the product of the two values of P taken from the table with the arguments — and — , where yz and yy are the mean lateral and the mean vertical deviations respectively.