NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Help W French Surveying Compass With Altitude??
From: Renee Mattie
Date: 2005 Apr 28, 09:47 -0400
From: Renee Mattie
Date: 2005 Apr 28, 09:47 -0400
I will attempt a translation of the directions that come
with the compass.
My French is pretty rusty. I will be using
freetranslation.com, and I will
be searching for my old French-English dictionary.
The older, the better
in this case, I imagine.
I have already sent Joel the following translation of the
final paragraph on PENTE.
I cannot make out every single word because of the curves
and marks on the page
and the resolution of the
photo. But I am hoping I will be able to make
out
(and translate!) the important ones.
SLOPE
Place the marked side of the box
on the line (??,??,??, etc.) of which
you want to have the inclination, the vertical
limb.
Read the angle of slope directly on the
limb,
and from it deduct the slope in ?hundredths?
at
the middle of the table.
Renee
From: Navigation Mailing List [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM] On Behalf Of Yourname Here
Sent: Thursday, April 28, 2005 7:22 AM
To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
Subject: Re: [NAV-L] HELP W FRENCH SURVEYING COMPASS WITH ALTITUDE??Thanks for your input Bill,I tried that, but there is noway to freeze the pendulum to take an accurate reading of what it points to on the scale after you have sighted the angle. Also the device doesn't seem to have an up or down indication and there are scales on both sides of the rose.Thanks much,Joel Jacobs--
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-------------- Original message from Bill <billyrem42@EARTHLINK.NET>: --------------
> > The compass card with the scales are printed in reverse. For a bearing, you
> > view through the black sighting vane with your line of vision into a circular
> > mirror in which you see the compass card in proper orientation, and through a
> > clear slit in the mirror which acts as the forward sighting vane you select
> > the target. There is what I take to be a brass pendulum which will point to a
> > scale, but to do this, the case has to be placed sideways. Doing that makes
> > viewing through the sighting vane impossible.
>
> Suspect you need to sight along the edge of the compass to read elevation.
> At least that is the way my Silva Ranger works. With the Silva, I can
> adjust the mirr! or lid to read the scale while sighting along the card edge.
>
> Bill
