The first and second flags would have determined the direction of the line of sight from A to B, and the third flag would have been 8 inches below the second the fourth flag, 32 inches the fifth, 6 feet the sixth, 10 feet 8 inches and the seventh, 16 feet 8 inches but the top of the last and largest flag, being 3 feet higher than the smaller ones, would have been 13 feet 8 inches below the line of sight at the point B. The water curvating from ” “ C to D, each flag would have been a given amount below the line A, B. If the earth is a globe, the series of flags in the last experiment would have had the form and produced the results represented in the diagram, Fig. Hence the surface of the water C, D, was equidistant from the line of sight A, B and as A B was a right line, C, D, being parallel, was also a right line or, in other words, the surface of the water, C, D, was for six miles absolutely horizontal. The altitude of the point B above the water at D was 5 feet, and the altitude of the telescope at A above the water at C was 5 feet and each intervening flag had the same altitude. ” “ On looking with a good telescope over and along the flags, from A to B, the line of sight fell on the lower part of the larger flag at B. Close to the last flag in the series a longer staff was fixed, bearing a flag 3 feet square, and the top of which was 8 feet above the surface of the water-the bottom being in a line with the tops of the other and intervening flags, as shown in the following diagram, Fig, 4. “ Along the edge of the water, in the same canal, six flags were placed, one statute mile from each other, and so arranged that the top of each flag was 5 feet above the surface. Of special interest, and in regards to the popularized subject of refraction, we look at the second experiment in the text.įrom Experiment Two of Earth Not a Globe we read: The Bedford Canal is a man-made canal which was selected as the most ideal location for the types of experiments performed due to the narrow passageways and low disturbance of the water's surface. Rowbotham lives near the canal and performs the experiment numerous times over a long period of time. The classic Flat Earth water convexity experiments were described in the book Earth Not a Globe by Samuel Birley Rowbotham. Water Convexity Experiments The Bedford Canal Experiments
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