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    Re: Home made artificial horizon
    From: Gary LaPook
    Date: 2011 Oct 4, 10:31 -0700
    According to the manual it is. Using the normal quadrant mounted on the cannon you could only set in elevations to one mil precision, about three minutes. But when doing "precision fire," we computed the elevation for the cannons to one-tenth of a mil and then set the gunner's quadrant to one-tenth of a mil before placing it on the quadrant seats located on the breech ring of the cannon. We then elevated the tube until the bubble was centered.

    We also had to periodically test the accuracy of the gunner's quadrant, first doing an "end for end test" and then a "micrometer test" so I am confident in their accuracy.


    --- On Tue, 10/4/11, G Becker <george@gwbeckerpls.com> wrote:

    From: G Becker <george@gwbeckerpls.com>
    Subject: [NavList] Re: Home made artificial horizon
    To: NavList@fer3.com
    Date: Tuesday, October 4, 2011, 5:14 AM

    Are you sure the gunner's quadrant can reach that precision? it has a spirit level which is typically only around 1 minute. The coincidence level is a little more accurate, supposedly it can reach 1/4 second of arc.
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