October 20 –
English astronomer
Norman Lockyer observes and names the D3Fraunhofer line in the solar spectrum and concludes that it is caused by a hitherto unidentified
element which he later names
helium.[7]
^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.
^Hampel, Clifford A. (1968). The Encyclopedia of the Chemical Elements. New York: Van Nostrand Reinhold. pp. 256–268.
ISBN0-442-15598-0.
^Coe, Brian (1978). Colour Photography: the first hundred years 1840-1940. London: Ash & Grant.
ISBN0-904069-24-9.
^Vilardell, F. (2006).
"Rigid gastroscopes". Digestive endoscopy in the second millennium: from the Lichtleiter to echoendoscopy. Stuttgart: Thieme. pp. 32–5.
ISBN978-3-13-139671-6. Retrieved 2010-09-06.
October 20 –
English astronomer
Norman Lockyer observes and names the D3Fraunhofer line in the solar spectrum and concludes that it is caused by a hitherto unidentified
element which he later names
helium.[7]
^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.
^Hampel, Clifford A. (1968). The Encyclopedia of the Chemical Elements. New York: Van Nostrand Reinhold. pp. 256–268.
ISBN0-442-15598-0.
^Coe, Brian (1978). Colour Photography: the first hundred years 1840-1940. London: Ash & Grant.
ISBN0-904069-24-9.
^Vilardell, F. (2006).
"Rigid gastroscopes". Digestive endoscopy in the second millennium: from the Lichtleiter to echoendoscopy. Stuttgart: Thieme. pp. 32–5.
ISBN978-3-13-139671-6. Retrieved 2010-09-06.