6 months ago
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A pencil sketch discovered successful a notebook astatine the National Library of Scotland has rekindled involvement successful the historical Thiruvananthapuram Observatory’s pivotal relation successful geomagnetic research.
The sketch, depicting a magnetic observatory erstwhile located successful Cherthala, was unearthed by a probe squad led by Prof. R. Jayakrishnan, the contiguous manager of the Observatory (then the Trivandrum Observatory).
This find prompted a elaborate probe into the technological bequest of the observatory, culminating successful a probe insubstantial titled ‘162 years of rendezvous with the Magnetic Equator by the Travancore Observatory’, published successful the Indian Journal of History of Science.The insubstantial chronicles the observatory’s contributions to mapping the magnetic equator successful India and tracking its gradual southward migration toward Sri Lanka.
The first-ever magnetic equator representation successful India was published successful 1839 done the collaborative efforts of John Caldecott, past manager of the observatory, and T.G. Taylor of the Madras Observatory. Their findings revealed that the magnetic dip equator (a presumption wherever the Earth’s magnetic tract is perfectly horizontal, and the magnetometer shows a ‘zero’ speechmaking for the vertical component) laic astatine Bolghatty successful Ernakulam successful the westbound seashore and Manamelkudi successful Pudukkottai, Tamil Nadu successful the eastbound coast.
Over 2 centuries
Subsequent studies by East India Company engineers and Trivandrum Observatory scientists, including the renowned John Allan Broun, documented the equator’s continued migration. Over astir 2 centuries, the observatory had meticulously traced this magnetic shift, portion providing uncommon information that constituent to a imaginable geomagnetic reversal, a improvement wherever Earth’s magnetic poles gradually power places.
When the Travancore kingdom became portion of the country, the Trivandrum Observatory was taken implicit by the Central government. In 1961, the observatory’s geomagnetic enactment transitioned to institutions similar the National Geophysical Research Institute (NGRI) and aboriginal the Indian Institute of Geomagnetism (IIG) successful 1971. Despite closure of the archetypal magnetic installation successful 1999 and its relocation to Tirunelveli, the Thiruvananthapuram Observatory’s historical archives stay a treasure trove of data.
“We managed to retrieve immoderate 40 documents from planetary repositories including Munich University, which see the 2nd Almanac printed for the observatory for the twelvemonth 1839, but we volition deficiency the archetypal Almanac for 1838. Compiling information from the Almanac from the twelvemonth 1839 to 1941 we person made the find that Thiruvananthapuram Observatory recorded the question of the magnetic equator some successful the southward and northward absorption successful those 98 years,” Prof. Jayakrishnan said.
He added that the Thiruvananthapuram Observatory is the lone successful the satellite that whitethorn person recorded the migration of the magnetic equator implicit its geographical location.
