On a visit to NIST Boulder (then known as NBS) many years ago (1978), I was
presented with a copy of NBS Monograph 155, "From Sundials to Atomic
Clocks" by one of the authors. I found it to be a fantastic read, it
answers all of those questions about Time & Frequency that you were afraid
to ask.
I stumbled on it again today in PDF form on the NIST website, it has
undergone two revisions and this URL points to the most current (1999) edition.
http://tf.nist.gov/general/pdf/1796.pdf
-Mike-
WA6ZTY
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