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*From*: Bernard Cleyet <bernardcleyet@redshift.com>*Date*: Thu, 28 Oct 2010 21:00:23 -0700

BTW, Stong's Amateur Scientist (Sci. Am. Sept. '63)

gives instructions for a Mitchell torsion balance; it's large -- suspension 55" (#36 music wire**) arm, 41" weights (masses) 46 oz. juice can lead filled, and 100 gm. Both cylindrical -- like the recent rather more accurate one using W. Spheres are best, but diff. to accurately machine, no?

** I remember reading another one using 1/4" mag. tape.

bc notes included an electrostatic shield -- much larger constant!

On 2010, Oct 28, , at 10:39, Bernard Cleyet wrote:

Yes, and I think credit should be given to Michell who made the beta version of the balance and gave it (indirectly) to C. just before he (Michell) died.

cut

**Follow-Ups**:**Re: [Phys-l] How did Newton estimate the Gravitational constant?***From:*"Dan L. MacIsaac" <danmacisaac@mac.com>

**Re: [Phys-l] How did Newton estimate the Gravitational constant?***From:*brian whatcott <betwys1@sbcglobal.net>

**References**:**[Phys-l] How did Newton estimate the Gravitational constant?***From:*Brian Blais <bblais@bryant.edu>

**Re: [Phys-l] How did Newton estimate the Gravitational constant?***From:*brian whatcott <betwys1@sbcglobal.net>

**Re: [Phys-l] How did Newton estimate the Gravitational constant?***From:*"Karshner, Gary" <gkarshner@stmarytx.edu>

**Re: [Phys-l] How did Newton estimate the Gravitational constant?***From:*Bernard Cleyet <bernardcleyet@redshift.com>

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