and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Clock Calibration
On Thu, Jan 27, 2011 at 12:55 PM, Perry Sandeen sandee...@yahoo.com wrote:
...how the heck they were able to calibrate a clock to milliseconds per day
back then?
Let it run for 1,000 days, then you only need
-
n...@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Clock Calibration
On Thu, Jan 27, 2011 at 12:55 PM, Perry Sandeen
sandee...@yahoo.com wrote:
...how the heck they were able to calibrate a clock to
milliseconds
List,
I was reading some of the history of mechanical clocks and was astonished to
see that one guaranteed its accuracy to 2 milliseconds per day! (And it was)
Now this same clock when tested with modern equipment tested to be accurate to
200 micro-seconds per day. Astonishing!
This got to
Hi Perrier:
When was this?
Do you have a URL?
Have Fun,
Brooke Clarke
http://www.PRC68.com
Perry Sandeen wrote:
List,
I was reading some of the history of mechanical clocks and was astonished to
see that one guaranteed its accuracy to 2 milliseconds per day! (And it was)
Now this same
Boy I sure don't know but.
I could make some assumptions especially if it were 100 years ago. I might
guess its either a sun or star track and the fact that exactly 24 hours
later it crossed. Granted the clock could be adjusted so that its tick would
exactly cross. Most likely a light/candle and a
: Thursday, January 27, 2011 4:13 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Clock Calibration
Boy I sure don't know but.
I could make some assumptions especially if it were 100 years ago. I might
guess its either a sun or star track and the fact that exactly 24
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Sent: Thursday, January 27, 2011 9:56 PM
Subject: Re: [time-nuts] Clock Calibration
Hi
If you go by Wikipedia, 10 ms per day was considered pretty good in 1909.
Shortt clocks came along in 1929 and are mentioned as 1
On Thu, Jan 27, 2011 at 12:55 PM, Perry Sandeen sandee...@yahoo.com wrote:
...how the heck they were able to calibrate a clock to milliseconds per day
back then?
Let it run for 1,000 days, then you only need to be able to measure to
the nearest second to get to ms per day. Or maybe you can
