NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Double vial horizon prototype
From: Randall Morrow
Date: 2012 Jan 9, 11:56 -0800
Bill,
Thanks as always for the advice. As long as the mirror and the plate surfaces are themselves parallel, they should be parallel to each other when the mirror is glued into place. Correct? To simplify flattening the face of the steel plate I thought I would get two plates, put the valve lapping compound across the faces and rub them together until all irregularities are gone. This is similar to something I saw on a TV special about the reconstruction of the Parthenon in Athens. Sand grit poured through holes in a flat steel plate would grind the surfaces of stones flat, allowing stacking to make the columns. The face of the metal plate would then be flat and it wouldn't require machining as was needed in the aluminum plate I use now. If I remember my geometry right, the rays of light should hit the plate and the mirror at the same angle if the two are parallel, despite them being separated by the thickness of the mirror. Am I on track here?
Randy
Randall F Morrow PT
Kern County - Bakersfield
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Randall,
From: Randall Morrow
Date: 2012 Jan 9, 11:56 -0800
Bill,
Thanks as always for the advice. As long as the mirror and the plate surfaces are themselves parallel, they should be parallel to each other when the mirror is glued into place. Correct? To simplify flattening the face of the steel plate I thought I would get two plates, put the valve lapping compound across the faces and rub them together until all irregularities are gone. This is similar to something I saw on a TV special about the reconstruction of the Parthenon in Athens. Sand grit poured through holes in a flat steel plate would grind the surfaces of stones flat, allowing stacking to make the columns. The face of the metal plate would then be flat and it wouldn't require machining as was needed in the aluminum plate I use now. If I remember my geometry right, the rays of light should hit the plate and the mirror at the same angle if the two are parallel, despite them being separated by the thickness of the mirror. Am I on track here?
Randy
Randall F Morrow PT
Kern County - Bakersfield
NOTICE TO RECIPIENT: If you are not the intended recipient of this e-mail, you are prohibited from sharing, copying, or otherwise using or disclosing its contents. If you have received this e-mail in error, please notify the sender immediately by reply e-mail and permanently delete this e-mail and any attachments without reading, forwarding or saving them. Thank you.
| "Bill Morris"
<engineer@clear.net.nz>
Sent by: navlist-bounce@fer3.com 01/09/2012 10:49 AM
|
|
Randall,
Be a little careful. Your new prototype levels the board. The surface of the mirror may be in a different plane.
It's good to see that you have a vial production line going.
Bill
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