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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
^ S A/cTi^a/ /9caaemy, o/tfa/ruary /S, 327 n (orangle;; the pointI each ship, 0 the;phere t thend oferror. nd onUting)r usemeteriratediratedThe .hren- L 8 for leightmes alegreeicularid; inin theI theyiiffer- trans- for. messes, anq ticism therefore applies to the values of the multipliers given in the table. 326 (3) cuts the scoinciden (4)range, an (b)ard in tb Err (1)curve, a curves i (3 the spethe aticoincic (sign a ( aKno I I atgiat aflinedesi racattod. (3) Kotate radial arm iuilh ^c—,^^line of fire made by course of gun (or target). (4) Read across by range scale line to correction circle, and note result; thedesired range error in yards due to motion of gun (or target). for. 327 n (orangle ;; the pointL each ship, 0 theiphere t thend oferror,ad onluting)r usemeteriratediratedThe hren- 8 forleightmes alegreeicularid; inin the1 theyiiffer- trans- :;esses, anq bicism therefore applies to the values of the multipliers given in the table.
Text Appearing After Image:
APPENDICES 327 (5) Determine sign of error by glance at plotting board.Error in Deflection. (Use no curve.) (1) liotate upper disc until zero of speed circle coincides with speed of gun (ortarget) in knots on correction circle. Clanip discs together. (2) Eotate radial arm until range scale line intersects deflection circle at angleto line of fire made by course of gun (or target). (3) Eead across by range scale line to correction circle, and note result; thedesired error in knots due to motion of gun (or target). (4) Determine sign of error by glance at plotting board. Notes.—1. In all the above described operations, the position of the decimal pointat each step must be fixed by the operators general knowledge of the conditions in eachcase. 2. By angle is meant that angle less than 90° which the course of the firing ship,direction of apparent wind, or course of the target ship makes with the line of fire. 3. The corrections to be applied to the sights are numerically equal to thede

Note About Images