Figure 177. Line and lead information, fcattrf on tracer tenthtf f.

Figure 177. Line and lead information, fcattrf on tracer tenthtf f.

course«, particularly incoming and outgoing, the tracer may intersect the gunner's line of vision to the target in two places. Here, the gunner first sees the tracer passing the target in a tail-to-nose direction. Lead information, based upon a sensing of a tracer that appears to pass the target in this direction, is invalid. The target actually crosses the tracer path only once, entering the path nose first, and leaving tail last Because of the illusion of curvature, the gunner sees this passage when the tracer appears to float by the target in a nose-to-tail direction. Read when the tracer passes the target nose-to-tail.

169. Line Information a. Level and Nonlevel Crossing Courses.

(1) High, When the tracer is above the tar-get course line (A, flg 177).

(2) Low. When the tracer is below the target course line (B, flg 177).

(8) Line. When the tracer intersects a line from the gunner's eyes, through the target to infinity. This line might be described as the gunner's line of vision through the target to infinity (C and D, fig 177). In referring to a tracer that is ago mma i n

left RIGHT

178. Off-lb« tracer tenting» for inooming, outgoing,,tireotty at the gun, and very rteep diving court.

alined with the target, the term "line" 1s omitted, and only the lead sensing is mentioned. (The tracer must be alined with the target before a lead sensing can be made.)

b. Other Courses. For incoming, outgoing,""directly at the gun, and very steep diving courses, off-line sensings change from high or low to left and right (fig 178).

170» Lead Information a. Ahead. If the tracer intersects the gunner's line of vision beyond the target; i.e., if a portion of the tracer's path is hidden by the target tfip round is ahead, the lead is too great (C, fig 177).

b. Astern. If the tracer passes between the gunner's eye and the target, the sensing is astern or too little lead (A, fig 177).

c. Hit It the tracer path terminates in the target Itself, the sensing is lead correct, a hit (fig 179).

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