Identifier: workofprac00algegroundrich (find matches)
Title: 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
Year: 1917 (1910s)
Authors: Alger, Philip Rounseville, 1859-1912 United States. Naval Academy, Annapolis. Dept. of Ordnance and Gunnery Ingalls, James M. (James Monroe), 1837-1927
Subjects: Ballistics
Publisher: Annapolis, Md., The United States Naval Institute
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN

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foot-seconds; £/=F. Vo • • -Pseudo velocity at the vertex in foot-seconds. Uo).... Pseudo velocity at the point of fall in foot-seconds. 1. Ballistics^ isthe science of the motion of projectiles, and is divided into two Definitions,branches; namely, interior ballistics and exterior hallistics. 2. Interior ballistics is that branch of the science which treats of the motion ofthe projectile while in the gun and of the phenomena which cause and attend thismotion. 3. Exterior ballistics is that branch of the science which treats of the motion ofthe projectile after it leaves the gun. The investigations to be conducted underexterior ballistics therefore begin at the instant when the projectile leaves the muzzleof the gun. y ^22 EXTERIOR BALLISTICS 4. There are certain definitions connected with the travel of the projectile afterit leaves the gun, and certain symbols which are used to represent the quantities)vered by these definitions. These definitions and symbols will now be given.
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Figure 1.Elements of Trajectory. i?0/7 = (/) = Angle of Departure. Z/=: Point of Fall, Horizontal Range.DHO = w = Ang\e of Fall. Oi/^X^ Horizontal Range. Oi/^Line of Position.^Oi7 = p^Angle of Position.Z)J/i;=ra,=: Angle of Fall. Oi/ = Z = Range.BOi/ = i/i= Angle of Projection.BOA ::=j:= Angle of jump.AOM = \(/ = Angle of Elevation. (p = i^ + j + p = i^ + p- When p = 0. <t)z=yp=i\p-\-j.When p = y = 0, ^^\p = \p. 5. The trajectory is the curve traced by the projectile in its flight from themuzzle of the gunjtQ,th.e.fiist-point.af-iiripacl;^_wliich.-poiiit of impact is calleiljthepoint of fall; in other words, it is the path of the projectile between those two pointsConsidered as a curve. 6. The elements of the trajectory, broadly considered, are certain quantitieswhich are now to be defined, such as the initial velocity, range, time of flight, etc.,which enter into the mathematical consideration of the trajectory. 7. The range is the distance in a straight line from the gun to the pworkofprac00algegroundrich

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