picture of steam locomotive

Photo Credit: Danny O Next to contact breaker, spark plug has become the weakest section of the ignition system. It is mounted within the combustion chamber of the engine, where working conditions are- severe. During peak combustion conditions the temperature inside combustion chamber in the modern car engine could possibly be around 2500 ºC along with the pressure about 7 Mpa. Moreover a spark plug can also be encountered with thermal and load cycling fatigue on account of sudden adjustments to temperature and pressure-from the high temperature of burnt gas for the relatively low temperature with the air/fuel mixture and from your underhand during explosion with the air/fuel mixture to low pressure during induction. In addition, the spark plug has got to endure high voltage, mechanical vibration along with the corrosive atmosphere of combustion gages. A modern spark plug comes with an economical life of about 10,000-16,000 km. Between June 25 and 26, 1876, a combined force of Lakota and Northern Cheyenne led the United States 7th Cavalry in to a battle near the Little Bighorn River in what was then the eastern fringe of the Montana Territory. The engagement is well known by several names: the Battle of Greasy Grass, the Battle of Little Big Horn, and Custer's Last Stand. Perhaps the most well-known action in the Indian Wars, it absolutely was a remarkable victory for Sitting Bull and his awesome forces. They defeated a column of seven hundred men led by George Armstrong Custer; five in the Seventh's companies were annihilated and Custer himself was killed in the engagement together with two of his brothers and a brother-in-law. Known as the battle that left no white survivors, Little Big Horn has inspired more than 1,000 pieces of art, including over 40 films. Here are four of the best...