Affichage de 71 résultats

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.

The fond contains observations of the meridian circle reductions ( refers to the process of correcting the observed zenith distances measured by a meridian circle instrument ) taken from the Madras Observatory from the year 1862 to 1887. Meridian circle reductions refers to a process in astronomy and celestial navigation that involves observations made with a meridian circle instrument.

This fond contains letters, annual expenditure reports and bills of Kodaikanal and Madras Observatories. It also contains correspondence of John Eliot,Charles Michie Smith and R.E.V.Arbuthnot during July 1901 to March 1903 regarding the index slip, meteorological summaries, seismological reviews and disturbances and other reports like annual expenditure, bills, and telegraphs. It has a report on the condition and proceedings of the government observatory, Colaba, written by N.A.F.Moos. It also has letters from the Royal Society of India, H. Grubb, J. Larmer, R. Fuess, William Butler and Charles P. Butler to the Meteorological Department and Kodaikanal & Madras Observatory.

The album contains archival documents related to the building, instruments and observations at the Madras Observatory. It mainly includes an old photo of the Madras Observatory, a photocopy of the first observation taken in 1786 from the observatory, two pictures of Kater's pendulum hung in front of the Haswell clock in the observatory, a sketch of the Madras Observatory building from 1848 Taylor's catalogue and painting of Madras coast by Daniel.

The album contains photos of Norman Robert Pogson, an English astronomer who worked in India at the Madras Observatory as a Government astronomer during 1861-1891. He undertook observations of comets and found numerous minor planets. Pictures of his father, wife, and children, as well as old photos of Madras and Kodaikanal Observatory, are archived here. Images of C. R. Ragunathachary, who worked with Norman Robert Pogson, can be seen in this album. Some photos are related to his private observatory, Hartwell House, in England.

This fond contains letters, several photographs, and observations related to A. A Narayana Ayer during the year 1913-1920.

Madras M.S. Records was an important handwritten document maintained by M. Topping (1789-1796) and J. Goldingham (1796-1805), who were early astronomers of the Madras Observatory. The establishment of the Madras Observatory in 1786 was mentioned in this record.

This was a handwritten record of observations made at the Madras Observatory by J. Goldingham (1796- 1805). It records the correspondent eclipses of the first and second satellites of Jupiter at the Madras Observatory and of Musalipatam, which were determined by timing immersions and the emersions of the first and second Satellites of Jupiter. The record consists of 163 pages and is not in good condition.

This fond includes a comprehensive catalogue of the main fixed stars compiled at the East India Company's Observatory in Madras.

The book contains the proceedings of Madras Observatory and different government orders from the year 1857 to 1898. It is xerox copy of original books.