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Guest
October 4
People
Thomas Corwin Mendenhall
Born 4 Oct 1841; died 23 Mar 1924
American physicist and meteorologist, the first to propose the use of a ring pendulum for measuring absolute gravity. From 1889 to 1894 he served both as Director of the U.S. Coast and Geodetic Survey and also Superintendent of the U.S. Standard Weights and Measures where he oversaw the shift in the fundamental standards of the U.S. from the English yard and pound to the International Meter and Kilogram. Mendenhall devised a quarter second's pendulum for gravity measurements and instituted improvements in the measurement of base lines with wire tapes, in the construction of instruments for precise leveling and in the methods used in triangulation and gravity work, and developed a comprehensive plan for the study of terrestrial magnetism.
Max Planck
Died 4 Oct 1947 (born 23 Apr 1858)
Max (Karl Ernst Ludwig) Planck was a German theoretical physicist. He studied at Munich and Berlin, where he studied under Helmholz, Clausius and Kirchoff and subsequently joined the faculty.he became professor of theoretical physics (1889-1926). His work on the law of thermodynamics and the distribution of radiation from a black body led him to abandon classical Newtonian principles and introduce the quantum theory (1900), for which he was awarded the Nobel Prize for Physics in 1918. This assumes that energy is not infinitely subdivisible, but ultimately exists as discrete amounts he called quanta (Latin, "how much"). Further, the energy carried by a quantum depends in direct proportion to the frequency of its source radiation.
Events
Sputnik
In 1957, the Space Age began as the Soviet Union, to the dismay of the United States, launched Sputnik, the first manmade satellite, into orbit around the earth. The craft circled the earth every 95 minutes at almost 20,000 miles per hour 500 miles above the Earth. The Sputnik (meaning "companion" or "fellow traveller") was launched from Kazakhstan. It stayed in orbit for about three months. Sputnik fell from the sky on 4 Jan 1958. The 184-lb satellite had transmitted a radio signal picked up around the world, and instrumentation for temperature measurement.
Invention of navigation by satellite
In 1957, two Johns Hopkins University Applied Physics Laboratory scientists tracking Sputnik found they could determine its orbit by analyzing the Doppler shift of its radio signals during a single pass. They conjectured that if a satellite's position were known and predictable, then the Doppler shift of its signals could be used to locate a receiver on Earth - thus, one could navigate by satellite. A system called Transit, was developed and from 1964 assisted the security of U.S. nuclear deterrent submarines. From 1967, this evolved into a navigation system for all nations, a forerunner of the present Global Positioning System (GPS). Transit also made key contributions to space science and technology, geodesy and health.
http://www.todayinsci.com/10/10_04.htm
People
Thomas Corwin Mendenhall
Born 4 Oct 1841; died 23 Mar 1924
American physicist and meteorologist, the first to propose the use of a ring pendulum for measuring absolute gravity. From 1889 to 1894 he served both as Director of the U.S. Coast and Geodetic Survey and also Superintendent of the U.S. Standard Weights and Measures where he oversaw the shift in the fundamental standards of the U.S. from the English yard and pound to the International Meter and Kilogram. Mendenhall devised a quarter second's pendulum for gravity measurements and instituted improvements in the measurement of base lines with wire tapes, in the construction of instruments for precise leveling and in the methods used in triangulation and gravity work, and developed a comprehensive plan for the study of terrestrial magnetism.
Max Planck
Died 4 Oct 1947 (born 23 Apr 1858)
Max (Karl Ernst Ludwig) Planck was a German theoretical physicist. He studied at Munich and Berlin, where he studied under Helmholz, Clausius and Kirchoff and subsequently joined the faculty.he became professor of theoretical physics (1889-1926). His work on the law of thermodynamics and the distribution of radiation from a black body led him to abandon classical Newtonian principles and introduce the quantum theory (1900), for which he was awarded the Nobel Prize for Physics in 1918. This assumes that energy is not infinitely subdivisible, but ultimately exists as discrete amounts he called quanta (Latin, "how much"). Further, the energy carried by a quantum depends in direct proportion to the frequency of its source radiation.
Events
Sputnik
In 1957, the Space Age began as the Soviet Union, to the dismay of the United States, launched Sputnik, the first manmade satellite, into orbit around the earth. The craft circled the earth every 95 minutes at almost 20,000 miles per hour 500 miles above the Earth. The Sputnik (meaning "companion" or "fellow traveller") was launched from Kazakhstan. It stayed in orbit for about three months. Sputnik fell from the sky on 4 Jan 1958. The 184-lb satellite had transmitted a radio signal picked up around the world, and instrumentation for temperature measurement.
Invention of navigation by satellite
In 1957, two Johns Hopkins University Applied Physics Laboratory scientists tracking Sputnik found they could determine its orbit by analyzing the Doppler shift of its radio signals during a single pass. They conjectured that if a satellite's position were known and predictable, then the Doppler shift of its signals could be used to locate a receiver on Earth - thus, one could navigate by satellite. A system called Transit, was developed and from 1964 assisted the security of U.S. nuclear deterrent submarines. From 1967, this evolved into a navigation system for all nations, a forerunner of the present Global Positioning System (GPS). Transit also made key contributions to space science and technology, geodesy and health.
http://www.todayinsci.com/10/10_04.htm