Adding Machine, 1642. Inventor: Blaise Pascal (France) (1623-62). Earliest commercial machine invented by William Burroughs (USA) in St. Louis, Missouri in 1885.

Addressograph, 1893. Inventor: J.S. Duncan (USA). Manufactured in Chicago, Illinois.

Aeroplane, 1903. Inventors: Orville Wright (1871-1948) and Wilbur Wright (1867-1912), (USA) Kitty Hawk, North Carolina.

Airship (non-rigid), 1852. Inventor: Henri Giffard (France) (1825-82).

Steam-powered propeller flew over Paris (1852).

Airship (rigid), 1900. Inventor: Graf Ferdinand von Zeppelin (Germany) (1838-1917). Bodensee.

Antiseptic, 1867. Inventor : Dr. Joseph lister (England).

Arc Lamp, 1879. Inventor: C.F. Brush (USA) (1849-1929). Cleveland, Ohio.

Argon, 1894. Inventor: Sir William Ramsay and Baron Ray Leigh (Great Britain).

Aspirin, 1899. Inventor : Dr. Felix Hoffman, Germany.

Atom (Nuclear Model), 1911. Inventor: Ernest Rutherford, (1871- 1937) England.

Atom Bomb, 1945. Inventor : Julius Robert Oppenheimer (USA) (1904- 1967).

Atomic Theory (ancient) :
Leucippus Democritus (Greece) (500 BC).

Atomic Theory (modem) : John Dalton (England) (1808).

Autogiro, 1923. Inventor: Juan de la Cierva (Spain) (1896-1963). Horizontal unpowered rotor.

Automobile (steam), c. 1769. Inventor: Nicolas Cugnot (France) (1725- 1804). Three-wheeled military tractor. Oldest surviving is Italian Bordino (1854) in Turin.  

  Automobile (gasoline), 1855. Inventor: Karl Benz (Germany) (1844- 1929). Earliest model by Father Ferdinand Verbiest (d. 1687) c. 1665 in China. Earliest internal combustion automobile built (1862-63) by Jean Joseph Etienne Lenior (1822-1900) (France). First run by Benz Motorwagon, Manneheim in November or December 1885. Patented in January 29,1886. First powered handcart with internal combustion engine was by Siegfried Marcus (Austria) (c. 1864).  

Articles are written and edited by the Syskool Staffs.

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