John Evershed (1911 - 1923) Collection home page

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JOHN EVERSHED 1864 – 1956
  • Born on February 26, 1864 at Gomshall in Surrey, Evershed was educated privately and started to work in the chemical industry. At an early age he developed an interest in astronomy and established his own observatory at Kenley in Surrey in 1890. In 1906 he was appointed the assistant director of the Kodaikanal Observatory. In 1911 he succeeded Michie Smith as the director and at Kodaikanal he continued his work on prominences and with Mrs Evershed he published an important memoir on the distribution of prominences during the course of a solar cycle. Evershed had considerable experience of astronomical work before he joined Kodaikanal Observatory. Soon after his arrival here he took up a systematic study of the spectra of sunspots using two high dispersion grating spectrographs. On 7 January 1909 he made an outstanding discovery relating to sunspots, now known as ‘Evershed Effect’. His discovery revealed a radial motion of matter in the penumbral region of Sunspot – a result that was totally unexpected. This work, published in 1909, led to his election to the Royal Society in 1915 and to the award of the Gold Medal of the Royal Astronomical Society in 1916. Evershed also greatly improved the quality of the Spectroheliograms obtained at the Observatory. Another line of work to which Evershed and also Royds devoted considerable time and attention was the accurate measurement of the minute displacements of the solar absorption lines and the corresponding lines in the laboratory arc Spectra. Their intension being to clock the gravitational red shifts predicted from the general theory of relativity. Soon after his arrival in 1907, Evershed discovered the ultraviolet tail bands in Comet Daniel that are now described to CO+. Evershed made numerous studies of the planet Venus and of Nova Aquilae 1918. And his high dispersion spectra of Sirius have had the highest dispersion values employed in stellar spectroscopy until recently. While at Kodaikanal, he greatly improved the quality of the equipment of the Observatory, designing and building a large Spectrograph using a 5 – inch grating by Michelson.
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    Collection's Items (Sorted by Submit Date in Descending order): 81 to 100 of 142
    Issue DateTitleAuthor(s)
    1911-12Dante and medieval astronomyEvershed, M. A; Evershed, John
    1911-01On the angular speed of rotation of a long enduring prominenceEvershed, John
    1910-01Radial movement in Sun-spots (Second Paper)Evershed, John
    1909-06Pressure in the reversing layerEvershed, John
    1909-09Pressure in the reversing layerEvershed, John
    1909-03Sun-spots and solar temperatureEvershed, John
    1909Radial movement in Sun-spotsEvershed, John
    1909-03Radial movement in Sun-spotsEvershed, John
    1908A large prominenceEvershed, John
    1908-12Sun-spots and solar temperatureEvershed, John
    1908-05Helium absorption in the SunEvershed, John
    1908-05Solar prominences in 1907, observed at the Kodaikanal observatoryEvershed, John
    1907-05Distribution of prominences in latitude in the year 1906, from observations made at Kodaikanal on 156 days in the first half of the year, and 105 days in the second halfEvershed, John
    1957Biographical memoirs of fellows of the royal society: John EvershedStratton, F.J.M
    1906Report of the expedition to Pineda de la Sierra, SpainEvershed, John
    1904-04The Rumford spectroheliograph of the Yerkes observatoryEvershed, John
    1904-03Sun-spots and magnetic stormsEvershed, John
    1903Solar eclipse of 1900, May 28 - General discussion of spectroscopic resultsEvershed, John
    1901Wave-length determinations and general results obtained from a detailed examination of spectra photographed at the solar eclipse of January 22, 1898Evershed, John
    1900Solar eclipse of May 28, 1900. Preliminary report of the expedition to the South limit of totality to obtain photographs of the flash spectrum in high solar latitudesEvershed, John
    Collection's Items (Sorted by Submit Date in Descending order): 81 to 100 of 142