This is a height finder for the four 3-inch Anti-Aircraft guns on Sasedni Island. The height finder was coupled to the director , which would send it angles of azimuth and elevation to the target. The height finder would then measure the range to the target and convert it to target altitude. This data was returned to the director, which continuously calculated the azimuth, elevation, and fuze setting for the guns.
Photo courtesy of the Sitka Historical Society
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