Re: [Phys-L] Allan deviation

[Bernard Cleyet <bernard@cleyet.org>]

On 2015, Jul 13, , at 04:46, Bennett <bennett@oakland.edu> wrote:

> The strip is the (nearly) top , and I suspected the array of rods is for
> temp .comp.
>
> I can't steal from my Niece, and her husband is bigger than me,
>
> They also have a wall clock with pendulum,  much smaller.    I'm not sure
> if it is real.


Very inexpensive and useful are Fedchenko type E-M drives.  They use a PM on the bob and two coils w/ a transistor.  One is a sense, tother the drive.  

These, w/ also sold pendula, are added to silica tuning fork clocks.  Like the contrefaçons, grid irons, a nostalgia?  

bc reminded of the early horseless carriage with the wooden horse head urban myth.  


p.s. I’ve put some pics from Matthys & Rawlings.  Suspension and temperature compensation.  Here:  


Index of /Pendula, Horological and Otherwise/extracts_from_rawlings&Mathys  

http://www.cleyet.org/Pendula,%20Horological%20and%20Otherwise/extracts_from_rawlings&Mathys/  



Sorry not v. gud resolution, the text.