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A Polygraph is a duplicating device that produces a copy of a piece of writing simultaneously with the creation of the original, using pens and ink. Patented by John Isaac Hawkins on May 17, 1803, it was most famously used by the third U.S. president, Thomas Jefferson , who acquired his first polygraph in 1804 and later suggested improvements ...
One of the polygraphs used by Thomas Jefferson, a portable version. In document duplication (as opposed to law enforcement and such), a polygraph is a mechanical device that moves a second pen parallel to one held by a writer, enabling the writer to make a duplicate of a document as it is written.
American inventor Leonarde Keeler testing his improved polygraph on Arthur Koehler, a former witness for the prosecution at the 1935 trial of Richard Hauptmann. A polygraph, often incorrectly referred to as a lie detector test, [1] [2] [3] is a pseudoscientific [4] [5] [6] device or procedure that measures and records several physiological indicators such as blood pressure, pulse, respiration ...
The first electric synthesizer was invented in 1876 by Elisha Gray who accidentally discovered that he could control sound from a self vibrating electromagnetic circuit and in doing so, invented a basic single note oscillator. This musical telegraph used steel reeds whose oscillations were created and transmitted, over a telephone line, by ...
1660 - First of the Navigation Acts enumerates exports from the colonies. Execution of Mary Dyer. 1662 – Crown confirms the charters of Rhode Island and Connecticut. New Haven Colony incorporated into the Connecticut Colony. Half-Way Covenant in New England.
The Middle Colonies consisted of the present-day states of New York, New Jersey, Pennsylvania, and Delaware and were characterized by a large degree of religious, political, economic, and ethnic diversity. [59] The Dutch colony of New Netherland was taken over by the English and renamed New York.
The Middle Colonies had much fertile soil, which allowed the area to become a major exporter of wheat and other grains. The lumber and shipbuilding industries were also successful in the Middle Colonies because of the abundant forests, and Pennsylvania was moderately successful in the textile and iron industries.
The most populous emigration of the 17th century was that of the English, who after a series of wars with the Dutch and French came to dominate the Thirteen Colonies on the eastern coast of the present-day United States and other colonies such as Newfoundland and Rupert's Land in what is now Canada.