ATP-3-09-30 Observed Fires Download
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Crater and Shell Fragment Analysis and Reports 28 September 2017 ATP 3-09.30 B-3 entered the ground instead of the fuze furrow and determine the direction in the same manner. This method is rarely possible, however, since indications of the point of entry are usually destroyed by the explosion of the shell. The five steps of this method are as follows: Place a stake in the center of the crater. Place a second stake in the fuze furrow at the point where the fuze was blown forward to the front of crater. Setup direction-measuring instrument in line with the stakes and away from fragments. Orient the instruments. Measure the direction to the hostile weapons. Figure B-2. Fuze furrow and center-of-crater method Side-spray Method B-10. Another method to measure the direction to a hostile weapon is to bisect the angle formed by the lines of side-spray (see figure B-3 on page B-4). The seven steps in the side spray method are as follows: Place a stake in the center of the crater. Place two stakes, one at the end of each line of side spray, equidistant from the center stake. Hold a length of communications wire (or another appropriate field-expedient means) to each side- spray stake, and strike an arc forward of the fuze furrow. Place a stake where these arcs intersect. Set up a direction-measuring instrument in line with the center stake and the stake at the intersection of the arcs. Orient the instrument. Measure the direction to the firing weapon.