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aerial observation aiming apparatus aiming point airplane altitude angle of fall angle of incidence auxiliary target axial ballistic ballistic coefficient barrage battery commander battle map bracket caliber case-bursting shrapnel Cast-iron shell overlaid charge coefficient Complementary correction corresponding crest decigrades defilade deflection Delay fuse determined detonating fuse enemy's field of fire fire for effect firing-data book fourchette goniometer graduated heavy artillery height of burst howitzer initial velocity instantaneous fuse itzer kilometers large caliber line of fire line of observation materiel meters millimeters mils necessary nondelay number of rounds observed error obtained overlaid with steel parallax Percussion fuse perpendicular plane plotting board point of fall position possible projectile provisional quadrant elevation quadrant range range tables real target reference target ricochet rounds fired salvo sheaf shelters steel shell telescope terminal velocity terrain terrestrial observation stations theodolite time-fuse fire tion trajectory trenches verifying fire vertical fire wind zero zone
Page 3 - BY ORDER OF THE SECRETARY OF WAR. JOHN BIDDLE, Major General, Acting Chief of Staff. OFFICIAL: HP MCCAIN, The Adjutant General.
Page 50 - between the tangent to the trajectory at the point of fall and the horizontal plane.
Page 29 - our willingness to return his fire with interest. It is directed on