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bessemer process
The bessemer process is were they make iron into steel. by removal of impurities from the iron by oxidation. Henry Bessemer, who took out a patent on the process in 1855 -
barbed wire
The first patent in the United States for barbed wire was issued in 1867 to Lucien B. Smith of Kent, Ohio, barbed wire helped randers facne in lager arers -
air brakes
George Westinghouse first developed air brakes for use in railway service. He patented a safer air brake on March 5, 1872. it made the railroads alot saver an the trands didnt take as to slow down -
Alternating Current
In alternating current the movement of electric charge differnet direction. AC is the form in which electric power is delivered to businesses and residences. The usual waveform of an AC power circuit is a sine waves. Audio and radio signals carried on electrical wires are also examples of alternating current. -
Maxim gun
The Maxim gun was the first self-powered machine gun, invented by Sir Hiram Maxim in 1884. -
Incandescent light bulb