Inventions & their Inventors

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INVENTION	YEAR		INVENTOR	PLACE
Aeroplane	1903		Wright Brothers	U.S.
Air Conditioning	1911		Willis Carrier	U.S.
Atom (nuclear model)	1911		Ernest Rutherford	England
Arc Lamp	1879		C.F. Brush	Cleveland
Bacteria	1683		Anton van Leeuwenhoek	The Netherlands
Barometer	1644		E. Torricelli	Italy
Ballpoint Pen	1888		John J. Loud	U.S.
Bicycle	1839	A K Macmillan		Scotland
Bicycle Tyre	1888		John Boyd Dunlop	Scotland
Braille	1829		Louis Braille	France
Bifocal Lens	1780		Benjamin Franklin	U.S.
Calculating Machine	1614		John Napier	Scotland
Camera (Hand Held)	1888		George Eastman	U.S.
Cells	1665		Robert Hooke	England
Centigrade Scale	1742		A. Celsius	France
Cellophane	1900		J.E. Brandenberger	Switzerland
Cement	1824		Joseph Aspdin	England
Cinema	1895		A.L. and J.L Lumiere	France
Cinematograph	1891		Thomas Alva Edison	US
Clock( Mechanical )	1725		Hsing and Ling-Tsan	China
Clock (Pendulum )	1657		Christian Huygens	The Netherlands
Computer	1834		Charles Babbage	Britain
Diesel Engine	1892		Rudolf Diesel	Germany
DNA	1869		Friedrich Meischer	Germany
Dynamite	1867		Alfred Nobel	Seeden
Dynamo	1831		Michael Faraday	England
Disk Brake	1902		Dr. F. Lanchester	England
Electric Iron	1882		H.W. Seeley	US
Electric Lamp	1879		Thomas Alva Edison	US
Electric Motor (DC)	1873		Zenobe Gramme	Belgium
Electric Motor (AC)	1888		Nikola Tesla	US
Electromagnet	1823		William Sturgeon	England
Electron	1897		Sir Joseph J. Thompson	England
Elevator	1852		Elisha G. Otis	US
Film (Musical)	1923		Dr. Lee de Forest	US
Film (Talking)	1926		Warner Bros.	US
Fountain Pen	1884		Lewis E. Waterman	US
Generator	1860		Piciontti	Italian
Gramophone	1878		Thomas Alva Edison	US
Gun Powder	C.700		Not Known	China
Helicopter	1930		D’ Asscanio	Italy
Jet Engine	1937		Sir Frank Whittle	England
LCD	1970		Hoffmann-La Roche	Switzerland
Lens(Bifocal)	1760		Benjamin Franklin	US
Lift	1852		E.G. Otis	US
Laser	1960		Dr. Charles H. Townes	US
Lightning Conductor	1752		Benjamin Franklin	US
Locomotive	1804		Richard Travithick	England
Loudspeaker	1924		Rice Kellogg	US
Machine Gun	1861		Richard Gatling	US
Match	1855		J.E. Lundstrom	Sweden
Microphone	1878		David Hughes	US
Microscope	1590		Zacharis Janssen	Netherlands
Motorcycle	1848		Edward Butler	England
Motor Scooter	1919		Greville Bradshaw	England
Microwave oven	1947		Percy Spencer	US
Neutron	1932		James Chadwick	England
Nuclear reactor	1942		Enrico Fermi	Italy
Neon Lamp	1915		Georges Claude	France
Nylon	1937		Dr. Wallace H. Carothers	US
Oxygen	1774		Joseph Priestley	England
Ozone	1839		Christian Schonbein	Germany
Paper	A.D. 150		Unknown	China
Parachute	1797		Louis Lenormand	France
Parking Meter	1935		Corlton C. Magee	US
Phonograph	1878		Thomas Alva Edison	US
Photography (On Metal)	1826		J. Nicephore Niece	France
Photography (On Paper)	1835		W.H. Fox Talbot	England
Photography(On Film)	1888		John Carbutt	US
Polio, Vaccine	1952		Jonas E. Salk	US
Pressure Cooker	1679		Denis Papin	France
Printing Press	1455		J. Gutenberg	Germany
Proton	1919		Ernest Rutherford	England
Rabies Immunization	1885		Louis Pasteur	France
Radar	1922		Dr. A.H. Taylor and L.C. Young	US
Radio	1873		James Clerk Maxwell	England
Rayon	1883		Sir Joseph Swann	England
Razor (safety)	1895		King C. Gillette	US
Razor (electric)	1931		Col. Jacob Schick	US
Refrigerator	1851		James Harrison	Scotland
Revolver	1835		Samuel Colt	US
Rubber (waterproof)	1819		Charles Macintosh	Scotland
Rubber(Vulcanized)	1841		Charles Goodyear	US
Rubber (tyres)	1857		Thomas Hancock	England
Rubber(Latex Foam)	1928		Dunlop Rubber Co.	England
Safety Pin	1849		William Hunt	US
Sewing Machine	1846		Elias Howe	US
Silicones	1904		Prof. F.S, Kippin	England
Skyscraper	1882		William Le Baron Jenny	US
Steel Production	1885		Henry Bessemer	England
Steel (stainless)	1913		Henry Brearley	England
Solar Energy	1860s		John Ericsson	US
Telephone	1876		Alexander Graham Bell	US
Telescope	1608		Hans Lippershey	Netherlands
Television	1926		John Logie Baird	Scotland
Thermometer	1593		Galileo Galilei	Italy
Tractor	1892		John Froelich	US
Transformer	1842		William Stanley	US
Transistor	1949		A Bardeen, Shockley and Brattain	US
Typewriter	1864		Mitterhofer	Australia
Vaccination	1796		Edward Jenner	England
Vitamins	1912		Sir F.G. Hopkins, Casimir Funk	England
Washing Machine (electric)	1907		Hurely Machine Co.	US
Watch	1791		Abraham-Louis Breguet	France
Welder(electric)	1877		Elisha Thomsan	US
X-ray	1895		Wilhelm von Roentgen	Germany
Zero	c.600		India	India

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Trigonometry And Its Short Tricks

Trigonometric Function Trigonometric Functions (Right Triangle) Special Angles Trigonometric Function Values in Quadrants II, III, and IV Examples: Example2: Example: 3: Unit Circle Addition Formulas: cos(X+Y) = cosXcoxY – sinXsinY cos(X-Y) = cosXcoxY + sinXsinY sin(X+Y) = sinXcoxY + cosXsin sin(X-Y) = sinXcoxY – cosXsinY tan(X+Y) = [tanX+tanY]/ [1– tanXtanY] tan(X-Y) = [tanX-tanY]/ [1+ tanXtanY] cot(X+Y) = [cotX+cotY-1]/ [cotX+cotY] cot(X-Y) = [cotX+cotY+1]/ [cotX-cotY] Sum to Product Formulas: cosX + cosY = 2cos [(X+Y) / 2] cos[(X-Y)/2] sinX + sinY = 2sin [(X+Y) / 2] cos[(X-Y)/2] Difference to Product Formulas cosX - cosY = - 2sin [(X+Y) / 2] sin[(X-Y)/2] sinX + sinY = 2cos [(X+Y) / 2] sin[(X-Y)/2] Product to Sum/Difference Formulas cosXcosY = (1/2) [cos (x-Y) + cos (X+Y)] sinXcoxY = (1/2) [sin (x+Y) + sin (X-Y)] cosXsinY...

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