Balloon observation, and instructions on the subject of work in the basket

by United States. War Department. Division of Military Aeronautics

1. PREPARATION OF THE FIRE.

Draw on the map, and copy if possible on a vertical photograph, the line balloon target (alignment of the center of the objective) and draw through this point a perpendicular to the alignment. In case the observation is lateral, draw also the line battery target and its perpendicular.

To draw the line balloon target, it is not necessary to know the horizontal projection of the balloon. It is enough to find on the ground a point situated directly on the alignment of the center of the objective.