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Thomas Jefferson (April 13 [O.S. April 2], 1743 – July 4, 1826) was an American statesman, planter, diplomat, lawyer, architect, philosopher, and Founding Father who served as the third president of the United States from 1801 to 1809. [6] He was the primary author of the Declaration of Independence.
Jefferson called the polygraph "the finest invention of the present age". [3] [4] A description of Jefferson's office routine in his own words may be read online. [5] Another American, Benjamin Henry Latrobe was the first customer of Peale's and not only introduced the device to Jefferson but was also instrumental in its improvement. [6]
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 ...
When the Second Continental Congress met in Philadelphia, Jefferson's swivel chair is purported to be the chair he sat upon when he drafted the United States Declaration of Independence in 1776. [9] Jefferson later had the swivel chair sent to his Virginia plantation, Monticello , where he built a "writing paddle" onto its side in August 1791.
The Jefferson disk, or wheel cypher, is a cipher system for encrypting messages and used as a deterrent for codebreaking. Using 26 wheels, each with the letters of the alphabet arranged randomly around them, Thomas Jefferson invented the wheel cypher in 1795.
CHARLOTTSVILLE, Va. — Gardiner Hallock, Director of Restoration for Thomas Jefferson's mountaintop plantation, stood on a red-dirt floor inside a dusty rubble-stone room built in 1809.
From the first Apple computer to the COVID-19 vaccine, here are the most revolutionary inventions that were born in the U.S.A. in the past half-century.
Patent Board members, who also called themselves the "Commissioners for the Promotion of Useful Arts", [4] were given the authority to grant or refuse a patent after deciding if the invention or discovery was "sufficiently useful and important." [5] The first board members included Thomas Jefferson, Henry Knox, and Edmund Randolph.
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