Date: Mon, 13 Aug 2001 09:57:53 -0400

Author: Machele Bailey

Subject: Re: Wave pendulum Info

Post:

I did a quick graphical analysis of the period vs length data Doug provided...the
graph with the fit can be seen at
http://www.wfu.edu/physics/pira/postings/dougwave.htm
Hopefully, this will help if you want to build one with different measurements.

Chele

Doug Johnson wrote:

> Hi Paul and others,
> The frame is rigid and interlocking in structure. Cool design! The
> middle pendulum has a period of 1 second. It takes 20 seconds for all the
> pendulums to complete a full cycle. The largest pendulum to the smallest
> travels 17, 18, 19, *20, 21, 22, 23 swings per 20 second period. Below are
> the lengths of each pendulum from the top to the middle of the 25 mm brass
> sphere.
>
> 17 = 18.8 cm
> 18 = 20.5 cm
> 19 = 22.5 cm
> *20 = 24.8 cm
> 21 = 27.4 cm
> 22 = 30.6 cm
> 23 = 34.6 cm
>
> I can't figure out all the details on this demo yet, but it really works
> well! Have fun if you decide to build one. ...Doug
>
> >Doug,
> >
> >Thanks for the explanation. Your description implies an interger (or
> >half-interger) relationship between the lengths of the several pendulums. Do
> >you recall the various lengths? Also, how rigid is the mounting frame?
> >
> >Paul O. Johnson
> >

--
Machele Bailey-----Lab Manager-----Wake Forest University

-----"Nothing shocks me. I'm a scientist." - Indiana Jones-----

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