CD-Sextant - Build your own sextant - Pole Shift Survival Information
CD-Sextant - Build your own sextant - Pole Shift Survival Information
CD-Sextant - Build your own sextant - Pole Shift Survival Information
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<strong>CD</strong>-<strong>Sextant</strong> - <strong>Build</strong> <strong>your</strong> <strong>own</strong> <strong>sextant</strong><br />
Note: You may be tempted at this point to use a thinner mirror<br />
and eliminate the transparent part altogether. Don´t do that.<br />
This would introduce a refraction error. The direct (horizon)<br />
light ray must pass thru the glass, as the light ray from the star<br />
does.<br />
This can only be done if you use a front mirrored surface, such<br />
as a polished inox plate.<br />
Mirror supports<br />
I used Lego bricks to hold the mirrors. They have good dimensional precision and will guarantee a nearly correct 90° angle<br />
between the mirrors and <strong>CD</strong> parts. They will also allow the <strong>sextant</strong> to be assembled, disassembled, trimmed and parts to be<br />
replaced as needed.<br />
Of course other materials can be used if Lego bricks are not available. Try to use dimensionally precise objects, to build the<br />
mirror supports with right angles.<br />
Bonding the mirrors<br />
<strong>CD</strong> Center mirror:<br />
1) Working on a flat surface, bond the center mirror back to the large side of a 2x4 Lego<br />
brick. Make sure the mirror is perpendicular to the flat surface.<br />
http://www.tecepe.com.br/nav/<strong>CD</strong><strong>Sextant</strong>Project.htm (4 of 7) [9/2/2004 11:04:32 PM]
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