By James H. Riddle
There is a lot we now know about the heliograph stations that were established at Fort Whipple and Bald Mountain (Glassford Hill). In May of 1890, the signal officer in charge of the Whipple station, 1st Lieut. L. D. Tyson, 9th Infantry, wrote that for the first three days of the heliograph practice he had a detachment of three corporals and five privates from a signal class at Whipple who helped in manning his station. Their equipment included two heliographs, later reduced to one, a telescope and "the necessary" signal flags.
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