Page:Machine-gun tactics (IA machineguntactic00appl).pdf/63

 at 900 yards when firing at 1,000 should receive 1° 10-1/2 and not 1° 25-1/2. When proper instruments are not obtainable, very fair results may be obtained by using an ordinary clinometer. The necessary allowance for the height the gun is above the target must be made, or, in other words, the angle of sight as shown by the clinometer must be deducted from the quadrant elevation given on the gun.

[Illustration:

TO SHOW METHOD OF LAYING BY AIMING POSTS

aa. Aiming Posts (about 15^x apart and some distance in front of gun.)