NOTES ON THE CONSTRUCTION
AND USE OF AN
~Xjf£&7&.* ARMY WAR COLLEGE
THE GENERAL SERVICE SCHOOLS
Washington, D. C, 23d February, 1918.
The following notes on "An Artillery Ruler" are published for
the information of all concerned.
[062.1	 A. G. O.]
order of the Secretary of War:
Major General, Acting Chief of Staff.
H. P. McCAIN,
The Adjutant General.
Purpose of the ruler
Maps Scale of maps
Guns Range table of gun employed
Construction of the ruler Computation of range scales
Scale of slopes
Construction of the scale of slopes
Exaggerating the scale of horizontal equivalents
Computing horizontal equivalents
Arranging the scale of horizontal equivalents
Use of ruler in measuring range on angle of slope
Use of the artillery ruler
Firing out of a given position
Firing into a given position
To determine the best location for battery positions
PURPOSE OF THE RULER.
The ArtilleryRuler is designed to be used on contoured maps
for studying the following problems connected with artillery fire
and the choice of battery positions. It is a great labor saver.
By its use any of the following problems can be solved at a
Ist. To determine whether a battery can shoot out from a
2nd. To determine whether a battery can shoot into a hostile
3rd. To determine the best locations for battery positions.
4th. To determine the least range for a given battery position.
sth. To determine the dead space in the sector of a given
Scale of Maps.
The Artillery Ruler is designed for use in studying contoured
maps. It is necessary
that the range scale