Note 81 — Chapter VIII · THE GREAT ALEUTIAN CHAIN.
Reading edition
“The distance in statute miles between San Francisco and a point due south of Attoo, measured on the parallel of San Francisco, is 2,943.1 miles. The distance east from Attoo of a point due north of San Francisco, measured on the parallel of Attoo, is 2,214.5 miles. The amount of westing made in sailing from San Francisco to Attoo, on a great circle, is very nearly 2,582.5 miles.”—(Henry Gannett, Geographer U. S. Geological Survey: letter to author.)