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<p>[QUOTE=&quot;springfld.arsenal, post: 114747, member: 54&quot;]A reply from Brad on the sextant forum-this is the first one that fits the some of unique design characteristics of this thing!</p><p><br /></p><p><br /></p><p>The +/-2° measuring range, and the fact that the angle is taken between objects 180° apart speaks to a very specific celestial navigation device.</p><p><br /></p><p>It could be dip meter.&nbsp; The dip of the horizon is normally assumed in celestial navigation.&nbsp; However, the assumed dip can often be wrong, as a function of abnormal refraction. </p><p><br /></p><p>With a dip meter, one aligns the horizons 180° apart and measures the dip.&nbsp; This accounts for eye height and existing refraction.&nbsp; The measured value is divided by two to obtain the dip to one horizon. </p><p><br /></p><p>The measured dip is then substituted for assumed dip, yield a more precise reduction of the calculated angle from the observed angle of the sextant. </p><p><br /></p><p>I have no knowledge of what your device is, only what it &#039;could be&#039;, as the specifics described by you correspond to that detailed herein.&nbsp; This may be just a coincidence.</p><p><br /></p><p>Brad[/QUOTE]</p><p><br /></p>

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