Record

Authorised form of nameEssen; Louis (1908 - 1997)
SurnameEssen
ForenamesLouis
Dates1908 - 1997
NationalityBritish
Dates and placesBirth:
Nottingham, England, United Kingdom (06 September 1908)
Death:
Great Bookham, Surrey, England, United Kingdom (24 August 1997)
ActivityProfession:
Physicist
Research field:
Time; atomic clocks; speed of light; radar
Education:
University College, Nottingham, external degree granted from University of London, BSc in physics (1928); University of London PhD (1941), DSc (1948)
Career:
National Physical Laboratory (1929-1972); during the second world war worked on radar, developing ways of measuring frequencies; developed a new method to determine the speed of light; developed the first practical atomic clock in collaboration with Jack Parry; advocated replacing the ephemeris second with the atomic standard, ratified by international agreement in 1968; retired 1972
Honours:
OBE 1959
Medals/Awards:
Wolfe award of the Department of Scientific and Industrial Research; Popov gold medal of the USSR Academy of Sciences
Royal Society activityMembership:
Fellow
Election Date:
24/03/1960
RelationshipsWorked with D W Dye (FRS 1928) at NPL; married Joan Margery Greenhalgh (1937)
Published workshttps://www.worldcat.org/identities/lccn-nb2007013000/
SourcesSources:
Wikipedia; ODNB; PIF
References:
Essen, R 'The Birth of Atomic Time' (Peterborough) 2015
Essen, R 'Revolutions in Time. The World of Louis Essen, clockmaker and father of atomic time' (2020)
Obituaries:
Biographical Memoirs of Fellows of the Royal Society 1998 vol 44 pp 141-158, plate, by Sir Alan Cook
Virtual International Authority File http://viaf.org/viaf/78306292
Royal Society codeNA2141
Archives associated with this Fellow
Reference numberTitleDate
IM/001311Essen, LouisCirca 1984
RR/53/57Referee's report by William Henry Eccles, on a paper 'International frequency comparisons by means of standard radio frequency emissions' by Louis Essen[February 1935]
RR/59/64Referee's report by Arthur Mannering Tyndall, on a paper 'The dye quartz ring oscillator as a standard of frequency and time' by Louis Essen[February 1936]
RR/70/99Referee's report by John Turton Randall, on a paper 'The velocity of propagation of electromagnetic waves derived from the resonant frequencies of a cylindrical cavity resonator'by Louis Essen and A C Gordon-Smith1947
EC/1960/08Essen, Louis: certificate of election to the Royal Society
RR/49/105Referee's report by William Henry Eccles, on a paper 'The valve maintained tuning fork as a primary standard of frequency' by William David Dye and Louis Essen[October 1933]
RR/62/102Referee's report by James Hopwood Jeans, on a paper 'The effect of the fitzgerald-lorentz contraction on the frequency of longitudinal vibration of a rod' by A B Wood, G A Tomlinson and Louis Essen[September 1936]
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