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THE CLOCK OF THE LONG NOw - Long Now Foundation

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Torsionpedulum4.nb 2<br />

TorsionSpringConstant h b 3 ShearModulus 3L<br />

0.0803472 inch pound<br />

accounting forlongitudinal shear (I think this may be wong. SHould depned of angle)<br />

ShearCorrection <br />

0.0226642<br />

ElasticModulus h 4<br />

<br />

ShearModulus 120 b 2 L 2<br />

TorsionSpringConstant h b 3 ShearModulus 1 ShearCorrection<br />

0.0821682 inch pound<br />

According to Mark's, (but I think this is wrong)<br />

TorsionSpringConstant b 3 h 3 ShearModulus 3.6 L b 2 h 2<br />

0.0669292 inch pound<br />

According to Roak's 6th edition<br />

a h 2;<br />

z b 2;<br />

TorsionSpringConstantRoak <br />

az3 16<br />

3.36<br />

3 z<br />

1 <br />

a<br />

z 4<br />

<br />

12 a 4<br />

0.0793348 inch pound 0.00182101 inch pound 2<br />

ShearModulus L 8<br />

<br />

45 ElasticModulus

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