There were four 3-inch Anti Aircraft guns on Sasedni Island. The guns' targeting system consisted of a director (below) and a height-finder. Men would point the tracking scopes of the
director at the target. Angles of azimuth and elevation would then be
sent to the height finder so that it could also be pointed at the target. The
height finder determined the range to the target, which was converted to its
altitude. This data was returned to the director, which would then predict the target's location at the projectile's time of arrival.
Photo courtesy of the Sitka Historical Society
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