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82:, of the Imperial Academy of St. Petersburg who said that the Earth is about 6 degrees cooler than the air (based on measurements in Russia) and pointed out that Bossingault was wrong in assuming that the temperature underground below a depth of one foot was constant. He made observations on the solar eclipse of 21 December 1843 at Parrat near the origin of the Mahé river and noticed
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and reached Bombay in May 1821. He worked at Apollo Cotton as an assistant to Daniel West who was a family friend. A relative, William West had an interest in telescopes and microscopes as an evening amusement and this sparked off a scientific interest in John
Caldecott. In 1832 he was posted as a
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Caldecott married Selina, daughter of James
Somerville Darby of Dublin on 8 November 1825 at Bombay. This however did not work out well and she returned to England in 1827. He married again in 1835 to Sophia Rodgers at Allepey. Caldecott was elected to the Royal Society as well as the Royal
59:, a transit and equatorial telescopes were installed at the observatory. In April 1841, he also brought in instruments to measure the magnetic field of the Earth. He was interested in examining the magnetic field of the Earth at various parts, a scheme inspired by
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Caldecott was born in
Finsbury in London where his father, also John, and mother Susannah lived. He was christened on 1 November 1801 at St Luke's Church. John Caldecott (junior) went to India in 1820 on the
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63:. He was also very interested in matters of the temperature of the core of the Earth. He published his observations extensively and pursued these ideas until his death.
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Astronomical
Society in 1840. Caldecott died in 1849 at Trivandrum and his work was continued by Reverend Josiah Sperschneider until his position was succeeded by
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Caldecott, J. (1846). "Eclipse of the Sun on
December 21, 1843, observed at Parratt, three miles North of the Source of the Mahè River".
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Ratcliff, Jessica (2016). "Travancore's magnetic crusade: Geomagnetism and the geography of scientific production in a princely state".
26:) was an East India Company commercial agent, meteorologist and astronomer who worked in the court of the Raja of Travancore at the
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43:) and he saw the need for an astronomical observatory there. This idea was aired in 1836, supported by the Resident Colonel
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of
Travancore. An observatory was constructed at Trivandrum. The building was constructed by Captain Horsley of the
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Cosmos: a sketch of a physical description of the universe. Volume 5. Translated by E.C. Otte and W.S. Dallas
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Caldecott, J. (1846). "Observations of the Great Comet of 1843, made at the
Observatory of Trevandrum".
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157:"Observations on the Temperature of the Ground at Trevandrum, in India, from May 1842 to December 1845"
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His measurements of the temperature of the ground at different depths in
Trivandrum allowed him (and
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326:"Observations on the direction and intensity of the terrestrial magnetic force in southern India"
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Walding, Richard R.; Stone, Helen (2009). "The
Russian Prince and the Maharajah of Travancore".
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who commented on his observations) to point out errors in the assertions of
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of Madras and examined the magnetic field variations in southern India.
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55:. Opened in 1837, Caldecott was appointed as director. Two
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Fisher's Colonial Magazine and Commercial Maritime Journal
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Brewster, D. (1843). "Education in Southern India".
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commercial agent at the Indian port of Allepey (now
254:Monthly Notices of the Royal Astronomical Society
16:English businessman, astronomer and meteorologist
291:The British Journal for the History of Science
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250:"Observations of the great comet of 1844-5"
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70:Plan of the Travancore observatory (1837)
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324:Taylor, T.G.; Caldecott, John (1839).
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134:Humboldt, Alexander von (1866).
98:at the Trivandrum observatory.
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366:Markham, Clements R. (1871).
369:Memoir on the Indian Surveys
392:Biography of John Caldecott
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49:Swathi Thirunal Rama Varma
349:Journal of Kerala Studies
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173:10.1017/S0080456800022377
155:Caldecott, John (2013).
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422:Scientists from London
387:Will of John Caldecott
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248:Caldecott, J. (1845).
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