[time-nuts] Re: NBS 1000 CPS Tuning Fork Standard?

[Brooke Clarke]

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 at 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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>