NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Index mirror adjustment with offset mirror
From: Bill B
Date: 2014 Jan 15, 15:25 -0500
From: Bill B
Date: 2014 Jan 15, 15:25 -0500
On 1/15/2014 2:48 PM, Frank Reed wrote: > You also wrote: > "* It's not correct to use the top _edge_ of the dice. One must be > looking along the top plane." > > I'm not sure I understand the distinction you're drawing here. You sight > in line with the top edge of the two objects. Do you mean that one > should not be sighting from "above" trying to get the top faces of the > two dice to appear aligned? If that's what you meant, then yes, that's > an important distinction. The goal is to get the two top edges to align > in a straight line when viewed from exactly the height of the dice above > the arc. With my front silvered Astra, I use Celestaire's brass cylinders or Legos that I have matched with micrometer (lapped if necessary). (Legos are lighter and smaller, so can be stashed for use on the water if needed.) I also constructed a vane the same height as the top of the objects placed on the arc. This allow me to be certain that I am level with the top of the objects without prairie dogging.
