Air Commerce Bulletin Vol. 1 No. 14, page 16, January 15, 1930
Black Mountain, Calif. (site No. 29A.)—A 2,000,000-candlepower, 24-inch beacon, showing six rotations per minute, is in operation on the summit of Black Mountain approximately 3 miles south of Hornbrook. The elevation of the main beam above horizon is 0°.
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