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- Repeating_circle abstract "The repeating circle is an instrument for geodetic surveying, invented by Etienne Lenoir in 1784, while an assistant of Jean-Charles de Borda, who later improved the instrument. It was notable as being the equal of the great theodolite created by the renowned instrument maker, Jesse Ramsden. It was used to measure the meridian arc from Dunkirk to Barcelona by Delambre and Méchain.The repeating circle is made of two telescopes mounted on a shared axis with scales to measure the angle between the two. The instrument combines multiple measurements to increase accuracy with the following procedure:At this stage, the angle on the instrument is double the angle of interest between the points. Repeating the procedure causes the instrument to show 4x the angle of interest with further iterations increase it to 6x, 8x, and so on. In this way, many measurements can be added together, allowing some of the random measurement errors to cancel out.".
- Repeating_circle thumbnail Borda-repeating-circle.svg?width=300.
- Repeating_circle wikiPageID "17887911".
- Repeating_circle wikiPageRevisionID "541430444".
- Repeating_circle hasPhotoCollection Repeating_circle.
- Repeating_circle subject Category:Surveying_instruments.
- Repeating_circle type Artifact100021939.
- Repeating_circle type Device103183080.
- Repeating_circle type Instrument103574816.
- Repeating_circle type Instrumentality103575240.
- Repeating_circle type Object100002684.
- Repeating_circle type PhysicalEntity100001930.
- Repeating_circle type SurveyingInstrument104365484.
- Repeating_circle type SurveyingInstruments.
- Repeating_circle type Whole100003553.
- Repeating_circle comment "The repeating circle is an instrument for geodetic surveying, invented by Etienne Lenoir in 1784, while an assistant of Jean-Charles de Borda, who later improved the instrument. It was notable as being the equal of the great theodolite created by the renowned instrument maker, Jesse Ramsden.".
- Repeating_circle label "Bordakreis".
- Repeating_circle label "Círculo de reflexión".
- Repeating_circle label "Repeating circle".
- Repeating_circle label "Repetitiecirkel".
- Repeating_circle sameAs Bordakreis.
- Repeating_circle sameAs Círculo_de_reflexión.
- Repeating_circle sameAs Repetitiecirkel.
- Repeating_circle sameAs m.047qkh6.
- Repeating_circle sameAs Q893387.
- Repeating_circle sameAs Q893387.
- Repeating_circle sameAs Repeating_circle.
- Repeating_circle wasDerivedFrom Repeating_circle?oldid=541430444.
- Repeating_circle depiction Borda-repeating-circle.svg.
- Repeating_circle isPrimaryTopicOf Repeating_circle.
