By James H. Riddle
The date was May 15th, 1890, and the Army's Department of Arizona had just completed a major heliograph practice; it was, in fact, the largest the world had ever seen. I call it the "Volkmar Practice", after the man responsible for it, Col. Wm. J. Volkmar, the Assistant Adjutant General and Chief Signal Officer for the Department of Arizona. Although the practice lasted only sixteen days, preparations for it took months of reconnaissance and preparation.
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