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How was the length of a standard meter defined in the year 1791?


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Answered 2008-09-18 21:26:49

In the 18th century it was felt that a standard unit of length was needed. The French Academy of Sciences decided in 1791 that the meter would be defined by the dimensions of the planet earth.

The metre would be a unit of length such that Earth's meridian line (a line linking the equator with the north pole) was equal to ten million meters. Over the following years measurements of the meridian line that passes through Paris were attempted, so that a standard meter could be cast in metal.

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How was the length of the standard meter defined in the year 1791?

by the dimensions of the planet earth


How was the meter defined in 1791?

In 1791, the French Academy of Sciences selected the definition of the metre as being one ten-millionth of the length of the Earth's meridian along a quadrant, that is, the distance between the Equator and the North Pole.


How was the length of the standard meter defined defined in the year 1791?

The metre was originally intended to be one ten-millionth of the distance from the equator to the north pole running through Paris (making the distance from the equator to the north pole 10,000 km and the circumference of the earth 40,000 km [round that great circle]). It has since been redefined


Who invented the meter stick?

According to the first definition adopted in France in 1791, the meter was 0.0000001 quarter of the length of the Paris meridian. The size of a meter was defined on the basis of geodetic and astronomical measurements J.Delambre и P. Méchain. French master Lenoir was managed J.Borda (1799)was prepared the first standard meter as a measure of length limit - platinum stick width of about 25 mm, a thickness of about 4 mm, the distance between the ends, the unit of length equal to the highest. He got the name "meter archive" or "archival meter" (at the place of storage). However, as it turned out meter could not be exactly reproduced again because of the lack of accurate data about the figure of the Earth and of significant errors of geodetic measurements.The present length of the meter is made in accordance with the resolution of the 17th General Conference on Weights and Measures held in October 1983 in Paris (France) and is defined as the distance traveled by light in vacuum during a 1:299 792 458 stake seconds.


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How was a meter defined in 1791?

In the eighteenth century, there were two favoured approaches to the definition of the meter. One approach suggested that the metre be defined as the length of a 'seconds pendulum' (pendulum with a half-period of one second). Another suggestion was defining the metre as one ten-millionth of the length of the Earth's meridian along a quadrant (the distance from the Equator to the North Pole).In 1791, the French Academy of Sciences selected the latter definition (the one related to Earth's meridian) over the former (the one with the pendulum) because the force of gravity varies slightly over the surface of the Earth's surface, which affects the period of a pendulum.


What was used in determining the original length of a meter?

The origins of the meter go back to at least the 18th century. At that time, there were two competing approaches to the definition of a standard unit of length. Some suggested defining the meter as the length of a pendulum having a half-period of one second; others suggested defining the meter as one ten-millionth of the length of the earth's meridian along a quadrant (one fourth the circumference of the earth). In 1791, soon after the French Revolution, the French Academy of Sciences chose the meridian definition over the pendulum definition because the force of gravity varies slightly over the surface of the earth, affecting the period of the pendulum.


When did the word meter become used as a measurement term?

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The meter has quite a history. It arose out of changes in France after the revolution of the 1780's. The first definition in 1790 was the length of a pendulum with a half period of 1 second. In 1791 this was changed to be one ten-millionth of the distance from the equator to the north pole (through Paris of course). In 1799 a platinum bar became the standard, held in Paris. In 1889 the first General Conference on Weights and Measures defined a bar of platinum/iridium alloy, held at the melting point of ice. In 1960 this deinition was changed to be based on the wavelength of radiation from krypton 86. The current definition is based on the speed of light in a vacuum: one meter is the distance covered by light in 1/299,792,458 of a second, in a vacuum. For practical purposes, standard bars are kept in various places including in the US


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