Talk:Vijaydurg Fort

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Military history: Fortifications

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Helium

Helium was discovered in Guntur on the other side of India and in London. The French discoverer is Janssen and not Johnson has written a detailed report. please read: [1] he used a house in Guntoor owned by M. Jules Lafaucheur. Lockyer observed from there in 1898 ( to late for the discovery of helium which took part in 1868 please read: [2] --Stone (talk) 20:17, 18 December 2010 (UTC)[reply]

Rewriting the helium sections

Copy of the history section if helium

The first evidence of helium was observed on August 18, 1868 as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun. The line was detected by French astronomer Jules Janssen during a total solar eclipse in Guntur, India.^[1]^[2] This line was initially assumed to be sodium. On October 20 of the same year, English astronomer Norman Lockyer observed a yellow line in the solar spectrum, which he named the D₃ Fraunhofer line because it was near the known D₁ and D₂ lines of sodium.^[3]

Copy of the Discovery of Helium from the Vijaydurg Fort Helium

Sir Joseph Norman Lockyer, a British scientist was observing a solar eclipse from this fort on 18 August 1868.^{[citation needed]} It was during his observation that the Helium Gas was discovered on Sun in the form of a yellow flame! He named this as Helios which was later named as Helium. Vijaydurg can be credited as the place from where, Helium was discovered and observed on sun.^{[citation needed]}

Quote from Memorandum of the solar research carried on by Sir Norman Lockyer 1863-1906 by Lockyer

The grant was approved; but, in consequence of delays, the instrument did not reachme till October 1868, by which time I changed my residence from Wimbledon to 24 Fairfax Road, West Hampstead, where I had built and observatory, the 6 1/4-inch Cooke being still the instrument used. On October 20, 1868, I swa the bright lines, as I had anticipated in 1866.^[4]

Helium discovery for the Vijaydurg Fort article

Helium was discovered by two scientists independitly in 1868. French astronomer Jules Janssen observed helium emission lines on August 18, 1868 as a bright yellow line during a total solar eclipse in Guntur, India.^[1] On October 20 of the same year, English astronomer Norman Lockyer observed a yellow line in the solar spectrum. He took the observation in West Hampstead, United Kingdom.^[5] Norman Lockyer set up a observation post at the Vijaydurg Fort for the Solar eclipse of January 22, 1898. In his report he does not mention that he ever had been to the Fort before.^[6]

References

^ ^a ^b Kochhar, R. K. (1991). "French astronomers in India during the 17th – 19th centuries". Journal of the British Astronomical Association. 101 (2): 95–100. Bibcode:1991JBAA..101...95K.
^ Emsley, John (2001). Nature's Building Blocks. Oxford: Oxford University Press. pp. 175–179. ISBN 0-19-850341-5.
^ Clifford A. Hampel (1968). The Encyclopedia of the Chemical Elements. New York: Van Nostrand Reinhold. pp. 256–268. ISBN 0-442-15598-0.
^ Cortie, A. L. "Sir Norman Lockyer, 1836-1920". Astrophysical Journal. 53: 233–248. Bibcode:1921ApJ....53..233C.
^ Cortie, A. L. "Sir Norman Lockyer, 1836-1920". Astrophysical Journal. 53: 233–248. Bibcode:1921ApJ....53..233C.
^ Lockyer, Norman; Chisholm-Batten, R. N.; Pedler, A. (1901). "Total Eclipse of the Sun, January 22, 1898. Observations at ViziadrugAuthor". Philosophical Transactions of the Royal Society of London. 197: 151–227. JSTOR 90835.

what to rewrite ? 103.102.30.20 (talk) 06:25, 11 September 2021 (UTC)[reply]

[frnch-1] Kochhar, R. K. (1991). "French astronomers in India during the 17th – 19th centuries". Journal of the British Astronomical Association. 101 (2): 95–100. Bibcode:1991JBAA..101...95K.

[nbb-2] Emsley, John (2001). Nature's Building Blocks. Oxford: Oxford University Press. pp. 175–179. ISBN 0-19-850341-5.

[enc-3] Clifford A. Hampel (1968). The Encyclopedia of the Chemical Elements. New York: Van Nostrand Reinhold. pp. 256–268. ISBN 0-442-15598-0.

[4] Cortie, A. L. "Sir Norman Lockyer, 1836-1920". Astrophysical Journal. 53: 233–248. Bibcode:1921ApJ....53..233C.

[5] Cortie, A. L. "Sir Norman Lockyer, 1836-1920". Astrophysical Journal. 53: 233–248. Bibcode:1921ApJ....53..233C.

[6] Lockyer, Norman; Chisholm-Batten, R. N.; Pedler, A. (1901). "Total Eclipse of the Sun, January 22, 1898. Observations at ViziadrugAuthor". Philosophical Transactions of the Royal Society of London. 197: 151–227. JSTOR 90835.

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