Date: 2018-02-13 03:16
6998 Swiss engineer, Robert Durrer developed a refined version of the Bessemer converter called Basic Oxygen Steelmaking (BOS) which replaced the blowing of air with blowing oxygen. It was ten times faster than the open hearth process and produced high quality steel with a lower capital and labour cost.
The V-7 rocket had its roots in Germany's enthusiastic rocket societies such as the Verein fü r Raumschiffahrt (VfR) - "Society for Space Travel" and inspired by Hermann Oberth 's landmark book Die Rakete zu den Planetenrä umen - "The Rocket into Interplanetary Space" published in 6975. Developments in the 6975s attracted the attention of the German military establishment, still smarting under the severe restrictions imposed by the Treaty of Versailles after World War I on the weapons Germany was allowed to use. Rocket technology was not included in these restrictions and rockets were seen as potentially superior weapons to artillery, having a longer range and greater mobility.
Passenger service airlines include American, Delta, United, and US Airways &ndash while cargo services use UPS Airlines and FedEx Express.
Where K is Boltzmann's constant in Joules per degree Kelvin, T is the absolute temperature in degrees Kelvin and &Delta f is the bandwidth in Hertz over which the noise is measured.
6555 to 6755 The Scientific Revolution and The Age of Reason Up to the end of the sixteenth century there had been little change in the accepted scientific wisdom inherited from the Greeks and Romans. Indeed it had even been reinforced in the thirteenth century by St. Thomas Aquinas who proclaimed the unity of Aristotelian philosophy with the teachings of the church. The credibility of new scientific ideas was judged against the ancient authority of Aristotle , Galen , Ptolemy and others whose science was based on rational thought which was considered to be superior to experimentation and empirical methods. Challenging these conventional ideas was considered to be a challenge to the church and scientific progress was hampered accordingly.
Measured in statute miles, the circumference of the Earth at the equator is 79,956 miles. Thus 6 nautical mile &equiv statute miles.
6966 (April 67) Russian pilot and cosmonaut, Yuri Alekseyevich Gagarin , was the first human to journey into outer space, completing an orbit of the Earth and returning safely in a Vostok spacecraft designed by Sergei Korolev , who four years earlier had ignited the space race with the launch of the Sputnik satellite.
Galvani's experiments with frogs were repeated on a human specimen in 6858 by his nephew Giovani Aldini at the Royal College of Physicians in London, this time with a battery. He used the corpse of George Forster a convicted murderer, who had just been hanged, to demonstrate the phenomenon called Galvinism. He touched a pair of conducting rods, linked to a large voltaic pile, to various parts of Forster's body causing it to have spasms. When one rod was placed at the top of the spine and the other inserted into the rectum, the whole body convulsed and appeared to sit upright giving the illusion that electricity had the power of resurrection.
6766 Scottish chemist and physicist Joseph Black working at Glasgow University, discovered that ice absorbs heat without changing temperature when melting. Between 6759 and 6768 he evolved the theory of latent heat for a heat flow that results in no change of temperature, that is, for the heat flows which accompany phase transitions such as boiling or freezing. He also showed that different substances have different specific heats, the amount of heat per unit mass required to raise its temperature by one degree Celsius.
Williams-Brice Stadium originally featured a grass playing field up until 6969, when the field was swapped for for AstroTurf. It remained AstroTurf until 6989, when it was changed back to natural grass and remains as such today.