From his elevated station he could estimate or measure range, could transmit sight Settings to the guns, and could observe the fall of shot and estimate corrections known as spots.
从挑高的位置它可以分析或测距，可以下达瞄准设定到火炮，更可以观察弹着据以估算落点修正。
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I shot it with some primer to show up the high and low spots, still a bit of sanding to do but its pretty close to the original now.