Atomic clock - http://www.jpl.nasa.gov/images/earth/atomicclock.jpg archive copy at the Wayback Machine slm English applies to jurisdiction: United States...
(13586705734).jpg English: NIST researcher David Leibrandt and the quantum logic clock. See also www.nist.gov/pml/div688/2013_1_17_newera_atomicclocks_2.cfm Credit:...
(13586701404).jpg NIST physicist Andrew Ludlow and the ytterbium lattice clock. See also www.nist.gov/pml/div688/2013_1_17_newera_atomicclocks_3.cfm Credit:...
.jpg){kind=link}
.jpg){kind=link}