Astrometric instruments

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          Astrometric instruments

            17 Archival description results for Astrometric instruments

            Letter from the Deputy Director of the Madras Observatory to the Director of Kodaikanal and Madras Observatories regarding Madras Meridian Circle observations
            IND-IIA-F224-I10 · Item · 22-03-1902
            Part of Correspondence related to the transfers of various journals, periodicals, handbooks and publications to and from Kodaikanal Observatory from 1900 to 1923

            The letter is from the Deputy Director of the Madras Observatory to the Director of Kodaikanal and Madras Observatories regarding Madras meridian circle observations. It informs that the volumes of the mentioned observations have been forwarded to the Director of Laws Observatory, Missouri.

             Smith, Charles Michie
            Letter of John Evershed to Gilbert T. Walker instructing to use the R.A. clamp cords
            IND-IIA-F001-I21 · Item · 15-04-1921
            Part of Official and personal files of John Evershed with other Directors, famous astronomers and global institutes

            The letter was reply to D.O.No.2440 of the 8th instant, the R.A. clamp at Lahore is intended to be used with two cords and it was explained to Chowla. Further he mentioned about transit instrument and chronograph are extremly shoddy and not in accordance with specification.

             Evershed, John
            Observations on Fixed Stars with the Meridian Circle at the Government Observatory Madras (1883-1887)
            IND-IIA-F031-I08 · Item · 1894
            Part of The fond contains Results of observations of the fixed stars made with the Meridian Circle at the Government Observatory , Madras

            This fond includes instrumental corrections implemented from 1883 to 1887. Additionally, it features distinct outcomes of observations and average positions of stars during the years 1883 to 1887. Furthermore, the fond contains a distribution list of Madras astronomical publications.

             Pogson, Norman Robert
            Photometer - designed by Dr. Hartmann - 1912
            IND-IIA-F042 · Fond · 1912

            This item was an instrument used for measuring the intensity of a light source. It uses a light-sensing device that is calibrated to express intensity in a standard unit. Some optical elements such as lens etc. are also employed to incerase the sensitivity of the instrument.

             Hartmann
            Results of observations of the fixed stars made with the Meridian Circle at the Government Observatory , Madras
            IND-IIA-F031-I01 · Item · 1865
            Part of The fond contains Results of observations of the fixed stars made with the Meridian Circle at the Government Observatory , Madras

            Results of observations of the fixed stars made with the Meridian Circle at the Government Observatory , Madras, in the year 1862, 1863 and 1864 under the Direction of Norman Robert Pogson

             Pogson, Norman Robert
            Results of observations of the fixed stars made with the Meridian Circle at the Government Observatory , Madras, in the years 1871, 1872 and 1873 under the Direction of Norman Robert Pogson
            IND-IIA-F031-I04 · Item · 1871
            Part of The fond contains Results of observations of the fixed stars made with the Meridian Circle at the Government Observatory , Madras

            Results of observations of the fixed stars made with the Meridian Circle at the Government Observatory, Madras, in the years 1871, 1872 and 1873.

             Pogson, Norman Robert