Hi Eric:
While the paragraph on "frequency" (pdf page 49) has a detailed description of " Pendulum oscillations, see Fig 16" that
has reference letters, when I look at Fig 16 I do not see those letters.
So was hoping someone recognized that equipment.
It's interesting to read the description of time at NBS in 1927.
--
Have Fun,
Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how
well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.
-------- Original Message --------
Fig 16 refers to Fig 22 for “time”. Fig 22 shows a Riefler clock and
pendulum with electrical impulsing — discussed further on page 44.
A search of the entire document for references to “fig. 16” brings up page
40, which explains both Fig 16 and 17 at a high level.
On 2021 Oct 14, at 18:59 , Brooke Clarke via time-nuts
<time-nuts@lists.febo.com> wrote:
Hi:
Somehow I got dropped from the mailing list around March 9, but have been added
back.
Hi:
I recently stumbled onto this at the Wiki page for tuning forks:
https://en.wikipedia.org/wiki/Tuning_fork#In_clocks_and_watches
Showing an NBS 1,000 CPS standard.
related to a discussion on the GreenKeys list server about the history of the
tones used for radio teletype.
https://prc68.com/I/TuningForks.html#AFSK-Tones
and that lead to the NBS 1927 Yearbook pages 40 and pdf page 408
https://prc68.com/I/TuningForks.html#NBS_1000_CPS_Standard
https://www.google.com/books/edition/Standards_Yearbook/5h_9yYrnBCYC?hl=en&gbpv=0
Fig 16 (pdf pg 408) "Pendulum oscillations" and Fig 17 "Tuning-fork vibration".
Can someone explain what's shown in Fig 16 on pdf page 408? Maybe a Shortt
pendulum can sitting on a shelf off the stack of bricks?
--
Have Fun,
Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how
well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.
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