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Early designs of perpetual motion machines were done by Indian mathematician–astronomer Bhaskara II, who described a wheel (Bhāskara's wheel) that he claimed would run forever. [2] A drawing of a perpetual motion machine appeared in the sketchbook of Villard de Honnecourt, a 13th-century French master mason and architect.
A disk cipher device of the Jefferson type from the 2nd quarter of the 19th century in the National Cryptologic Museum. The Jefferson disk, also called the Bazeries cylinder or wheel cypher, [1] was a cipher system commonly attributed to Thomas Jefferson that uses a set of wheels or disks, each with letters of the alphabet arranged around their edge in an order, which is different for each ...
The SZ40 μ 61 motor wheel stepped every time but the μ 37 motor wheel stepped only if the first motor wheel was a '1'. The ψ wheels then stepped only if the second motor wheel was a '1'. [ 19 ] The SZ42A and SZ42B models added additional complexity to this mechanism, known at Bletchley Park as Limitations .
The Siemens & Halske T52, also known as the Geheimschreiber [1] ("secret teleprinter"), or Schlüsselfernschreibmaschine (SFM), was a World War II German cipher machine and teleprinter produced by the electrical engineering firm Siemens & Halske. The instrument and its traffic were codenamed Sturgeon by British cryptanalysts.
Notable proponents of the conspiracy theory include Gary McKinnon, a Scottish computer hacker who unlawfully accessed computer systems to look for evidence of a secret free energy device. [ 21 ] Followers of the Tartaria conspiracy theory believe an advanced civilization called Tartaria destroyed by a "mud flood" now covered up by the world's ...
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The Enigma machine was considered so secure that it was used to encipher the most top-secret messages. [1] The Enigma has an electromechanical rotor mechanism that scrambles the 26 letters of the alphabet. In typical use, one person enters text on the Enigma's keyboard and another person writes down which of the 26 lights above the keyboard ...
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