Samuel Birley Rowbotham (/ˈroʊbɒtəm/;[1] 1816 – 23 December 1884, in London) was an English inventor, writer,utopian socialist[2] andflat Earther who wroteZetetic Astronomy: Earth Not a Globe under thepseudonymParallax. His work was originally published as a 16-page pamphlet (1849), and later expanded into a book (1865).
Rowbotham's method, which he calledzetetic astronomy, models the Earth as aflat disc centered at theNorth Pole and bounded along its perimeter by a wall of ice, with the Sun, Moon, planets, and stars moving only several thousand miles above its surface.
Rowbotham's work is generally credited with themodern revival of belief in a flat Earth.[3]
Rowbotham started out as an organiser of anOwenite community atManea inthe Fens, where he formulated his ideas about the Earth. After measuring a lack of curvature on the long straight drainage ditches of theBedford Levels in his firstBedford Level experiment, he was convinced of the flatness of the Earth and began to lecture on the topic. He took a little time to learn his trade, running away from a lecture inBlackburn when he couldn't explain why the hulls of ships disappeared before their masts when sailing out to sea.[4] However, as he persisted in filling halls by charging sixpence a lecture, his quick-wittedness and debating skills were honed so much that he could "counter every argument with ingenuity, wit and consummate skill".[5]
When finally pinned down to a challenge inPlymouth in 1864 by allegations that he wouldn't agree to a test, Rowbotham appeared onPlymouth Hoe at the appointed time, witnessed byRichard A. Proctor, a writer on astronomy, and proceeded to the beach where a telescope had been set up. His opponents had claimed that only the lantern of theEddystone Lighthouse, some 14 miles out to sea, would be visible. In fact, only half the lantern was visible, yet Rowbotham claimed his opponents were wrong and that it proved the Earth was indeed flat so that many Plymouth folk left the Hoe agreeing that "some of the most important conclusions of modern astronomy had been seriously invalidated".[6]
In 1856, Rowbotham married for a second time and had two children, one of whom died in infancy. In 1861 when he was 46, Rowbotham married a 15-year-old girl (with whom he was living at the time of the marriage) and settled in London, producing 15 known children, of whom only four survived. He was named in numerous cases of wrongful deaths, including a "death by misadventure" for accidentally poisoning one of his own children. He was named responsible for other deaths using his quack cures ofphosphorus. He was also alleged to be using the name "Dr. Samuel Birley", living in a beautiful 12-roomed house, selling the secrets for prolonging human life and curing every disease imaginable.[7]Augustus De Morgan refers to him as S. Goulden.[4] He patented a number of inventions, including a "life-preserving cylindrical railway carriage". He is not known to have held any medical degrees and his professions are named at different times "chemist, physician, journalist, soap boiler".

His bookZetetic Astronomy: The Earth not a Globe appeared in 1865. His lectures continued and concerned citizens addressed letters to theAstronomer Royal seeking rebuttals for his claims. A correspondent to theLeeds Times observed that "One thing he did demonstrate was that scientific dabblers unused to platform advocacy are unable to cope with a man, a charlatan if you will (but clever and thoroughly up in his theory), thoroughly alive to the weakness of his opponents".[8]
One of Rowbotham's followers, John Hampden, a Christian polemicist, gained notoriety by engaging in raucous public debates with leading scientists of the day. A bet involving the prominent naturalistAlfred Russel Wallace in the famousBedford Level experiment led to several lawsuits for fraud and libel and Hampden's imprisonment.
In the United States, Rowbotham's ideas were taken up by theChristian Catholic Apostolic Church in 1914, and were promoted widely when the church added a radio station in 1923. His work in the United States was continued byWilliam Carpenter. Carpenter, a printer originally fromGreenwich,England, a supporter of Rowbotham and publishedTheoretical Astronomy Examined and Exposed — Proving the Earth not a Globe in eight parts from 1864 under the nameCommon Sense. He later emigrated toBaltimore where he publishedA Hundred Proofs the Earth is not a Globe in 1885.[9]
After Rowbotham's death,Lady Elizabeth Blount continued the Universal Zetetic Society which Rowbotham had founded.[10] The Society published a magazine entitledThe Earth Not a Globe Review and remained active well into the early part of the 20th century. After World War I, the movement underwent a slow decline, but it was revived in 1956 asThe Flat Earth Society.
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