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Autor:
L. Essen
Publikováno v:
Journal of the Institution of Electrical Engineers - Part IIIA: Radiolocation. 93:1413-1425
The theory and practice of the design of wavemeters for use at frequencies between 1,000 and 25,000 Mc/s are discussed. The method of calibrating the wavemeters in terms of a standard of frequency is described, and the results of experimental investi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c15e13c60d7d2edbb6e907d3572dedb5
https://doi.org/10.1049/ji-3a-1.1946.0240
https://doi.org/10.1049/ji-3a-1.1946.0240
Publikováno v:
Proceedings of the Physical Society. Section B. 68:422-446
New determinations have been made of the dielectric constants of benzene, cyclohexane, dichlorethane and nitrobenzene with the object of providing values of a higher accuracy than has hitherto been available for four standard liquids covering the ran
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5182b80fe84c9e4196f75de84e1409b6
https://doi.org/10.1088/0370-1301/68/7/305
https://doi.org/10.1088/0370-1301/68/7/305
Autor:
L. Essen
Publikováno v:
Journal of the Institution of Electrical Engineers. 4:647-653
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::110075583a9745013407c96d0e72c3e1
https://doi.org/10.1049/jiee-3.1958.0318
https://doi.org/10.1049/jiee-3.1958.0318
Autor:
L. Essen
Publikováno v:
IETE Journal of Research. 12:257-266
Standard frequency transmissions were first made from the NPL, England, in 1926 to assist E. V. Appleton in his researches on the ionosphere. Subsequently, they were used mainly for the dissemination of a standard of frequency although they have rece
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::04aa9521aaf2c4757c7737464bd9f652
https://doi.org/10.1080/03772063.1966.11485301
https://doi.org/10.1080/03772063.1966.11485301
Autor:
L Essen
Publikováno v:
Metrologia. 4:161-165
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae901299b9cd53bb29363fc51bae252b
https://doi.org/10.1088/0026-1394/4/4/003
https://doi.org/10.1088/0026-1394/4/4/003
Autor:
L. Essen
Publikováno v:
Proceedings of the Institution of Electronic and Radio Engineers. 6:3-6
The two time scales furnished by astronomical measurements have differed by up to 30 seconds in time or 7 parts in 108 in frequency. The atomic unit defined in terms of the caesium hyperfine line is accurate to within 1 part in 1011. The rubidium gas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4100c8bea547e3777899fba2fdd9eec0
https://doi.org/10.1049/piere.1968.0002
https://doi.org/10.1049/piere.1968.0002
Autor:
L. Essen
Publikováno v:
Vistas in Astronomy. 11:45-67
A distinction is made between epoch or time of day and duration or time interval. The unit of universal time U.T. was thought to be uniform but an annual variation of about ±1 part in 108 was revealed by quartz clocks, and long-term irregular variat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8284b5da379f9be59352de14dcac90ff
https://doi.org/10.1016/0083-6656(69)90004-x
https://doi.org/10.1016/0083-6656(69)90004-x
Autor:
L Essen
Publikováno v:
Proceedings of the Physical Society. 52:616-624
The paper describes a new method and equipment for the measurement of frequencies in the range 0 to 2000 Mc./sec. Frequencies less than 30 Mc./sec. are compared directly with a signal obtained from oscillators controlled by the standard, and the accu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::35a47c82d64a7d4e04aec1170a442ae4
https://doi.org/10.1088/0959-5309/52/5/302
https://doi.org/10.1088/0959-5309/52/5/302
Publikováno v:
Proceedings of the IEE - Part B: Radio and Electronic Engineering. 106:240-244
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1bb2edb6151bb642790505c771e4cc8e
https://doi.org/10.1049/pi-b-1.1959.0397
https://doi.org/10.1049/pi-b-1.1959.0397