200 Proof: Sight at a Distance

14) The Lieutenant-Colonel Portlock experiment used oxy-hydrogen Drummond’s lights and heliostats to reflect the sun’s rays across stations set up across 108 miles of St. George’s Channel. If the Earth were actually a ball 25,000 miles in circumference, Portlock’s light should have remained hidden under a mile and a half of curvature.

The referenced experiment was measuring the distance from Kippure (2,484 ft) to the peak of Precelley (greatest height of 1,759 feet). Using the same method in my prior post, you can calculate that the distance of vision would be up to 112 miles and within the measured findings.

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