On 24/01/2017 11:58, Chris Angelico wrote:
On Tue, Jan 24, 2017 at 10:52 PM, BartC <b...@freeuk.com> wrote:
Remember: If you have only one clock, it might be right and it might
be wrong, but it's consistent. If you have two clocks and they
disagree, you have no clue what the time is.
I've actually got three wall clocks. Usually only one will disagree with the
other two, meaning it needs a new battery. But don't they use such systems
in avionics?
See what Steve said about 1 or 3 but never 2. Triple redundancy gives
you a chance to figure out that two of them agree.
But even with two clocks you will know something is amiss if they don't
agree, and will seek confirmation from a third. With one clock you can't
be sure, and could end up missing your flight or whatever.
(Of course, when the clocks go forward in the spring, all the (cheap,
non-automatic) clocks in my house will show the same incorrect time!)
--
Bartc
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