This early bicycle design called the Penny-farthing was first produced about 1870. It used an enlarged front wheel instead of gears to create greater speed and a smoother ride. It was the first machine to be called a bicycle.
This American tandem rotor, heavy-lift helicopter was first used during the Vietnam War. Powered by two 4,733 horsepower turbo-shaft engines, it has a top speed of 196 mph which made it faster than any other utility and attack helicopter at that time. It remains in production and frontline service, with over 1,200 built to date.
Originally produced by McDonnell Douglas, this Boeing twin-engine army attack helicopter first entered service with the US Army in 1984. Since then it has become the primary attack helicopter of many nations. More than 2,000 have been produced.
Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London though today the name also refers to the clock and the clock tower. The bell weighs almost 14 tons and each clock face is 23 feet in diameter. It became fully operational on September 7th, 1859 and is today one of the most prominent symbols of London standing at 316 feet high. The clock requires winding three times per week and pennies are periodically added or removed from the clock of pendulum to maintain its accuracy.
This twin engine tactical fighter was designed for the U.S. Air Force to gain and maintain air superiority in aerial combat. It first flew July 1972 and has become among the most successful modern fighter jets with over 100 aerial combat victories.