Abstract
SEVERAL atomic frequency standards of different types are now in use for comparisons with astronomically determined time. As the adopted frequencies of these atomic standards have been derived from the smoothed universal time U.T. 2, which is itself variable in time1, they disagree by several parts in 109. In order to obtain a uniform base for the atomic times determined by the different standards, their frequencies have to be compared directly. This has been done between cæsium resonators at the National Physical Laboratory in Teddington and the Naval Observatory in Washington using the GBR 19.6 kc./s. transmissions. Later the same comparison was repeated between similar cæsium resonators at the National Physical Laboratory2.
Similar content being viewed by others
Article PDF
References
Essen, L., Parry, J. V. L., Markowitz, W., and Hall, G. R., Nature, 181, 1054 (1958).
Essen, L., Parry, J. V. L., and Pierce, J. A., Nature, 180, 526 (1957).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
BLASER, JP., BONANOMI, J. Comparison of an Ammonia Maser with a Cæsium Atomic Frequency Standard. Nature 182, 859 (1958). https://doi.org/10.1038/182859a0
Issue Date:
DOI: https://doi.org/10.1038/182859a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.