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Tag Archives: sea earth
The Three Pole Trick
The Three Pole Trick We have been authoritatively assured that the curvature of water can be proved by three poles, and a notable incident is referred to on the Bedford Canal, Cambridgeshire. “If three poles of exactly the same height … Continue reading
Curvature Or Dip?
Curvature Or Dip? In calculating the amount of curvature, or dip below the eye-line of the observer, we have a simple rule, ignoring some small decimal points, namely:— Square the number of miles given as the distance, and multiply the … Continue reading