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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Mark 15 Maintenance Question
From: Paul Flint
Date: 2005 Nov 21, 17:39 +0900
From: Paul Flint
Date: 2005 Nov 21, 17:39 +0900
I realize that this is not quite on topic, but I sent the following message to Davis support and got no response. I've had approximately three month's experience with a sextant, so I figure anyone here would know more about it than I. Any suggestions would be appreciated. -------------------------------------------------------------- Hi there. The index error adjustment screw on the horizon mirror (the one farthest from the frame) seems to be too loose even when properly adjusted. The screw is easily jogged out of position, which of course allows the mirror to shift. The screw seems to move quite freely from side to side unless completely tightened, which of course gives high a IE on the arc. As a result, I get 10' to 20' of "index error" in a very short period of time (like after one reading) when taking sights even after having adjusted the mirror. At first I thought it was the normal error attributed to heating of the plastic, but it is just too much fluctuation too quickly for that to be the case. Is this a common problem? Or, better yet, can you suggest a fix for it? Thanks. ------------------------------------------------------- Paul Flint Kawasaki, Japan N35 35' 41" E139 30' 30"