In message [EMAIL PROTECTED], Rob Seaman writes:
Any serious
proposal should include a serious risk analysis. Since we're talking
about changing an international standard that has held for 30+ years,
the onus falls on the group proposing a change.
And I think you will find that it was
In message [EMAIL PROTECTED], Brooke Clarke writes:
I've been reading some of these articles and notice that NBS started
work with Cesium standards around 1948, yet it was the Essen standard at
NPL in the UK that seems to be the important one. I take it that this
means that Essen's standard
Brooke,
My understanding is that NBS's early cesium work
got sidetracked due to the move from Maryland to
Colorado about that time. That's partly why NPL
gets the limelight.
The other reason is that the NPL cesium standard
operated as a continuous production-quality atomic
*clock*; while other
Several people on this forum have interest in H-Masers. Here is a paper
from a recent VLBI workshop designed to teach the PDOs (that means Poor
Dumb Operators -- telescope drives at the VLBI stations) a bit about
what is in the Maser box and why is it necessary:
