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<p>[QUOTE=&quot;moreotherstuff, post: 309667, member: 56&quot;]May be a thing called a Borda Circle (developed in the 1780s).</p><p><a href="https://www.google.com/search?q=borda+circle&amp;source=lnms&amp;tbm=isch&amp;sa=X&amp;ved=0ahUKEwiP-Yu0y_DXAhUhc98KHRI7AasQ_AUICigB&amp;biw=1102&amp;bih=619" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.google.com/search?q=borda+circle&amp;source=lnms&amp;tbm=isch&amp;sa=X&amp;ved=0ahUKEwiP-Yu0y_DXAhUhc98KHRI7AasQ_AUICigB&amp;biw=1102&amp;bih=619" rel="nofollow">https://www.google.com/search?q=borda+circle&amp;source=lnms&amp;tbm=isch&amp;sa=X&amp;ved=0ahUKEwiP-Yu0y_DXAhUhc98KHRI7AasQ_AUICigB&amp;biw=1102&amp;bih=619</a></p><p><br /></p><p>(Lots of stuff in this thread I&#039;ve never heard of before.)</p><p><br /></p><p>*********</p><p>Check reflecting circle instruments and geodetic survey instruments.</p><p>This may be for land based surveying and intended for use in a horizontal position.</p><p><br /></p><p>There&#039;s a similar type of engraving currently listed on eBay</p><p><a href="https://www.ebay.com/itm/EDWARD-TROUGHTON-REFLECTING-CIRCLE-ANTIQUE-SCIENTIFIC-TOOL-PATENT-ENGRAVING-1832-/141431053053" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.ebay.com/itm/EDWARD-TROUGHTON-REFLECTING-CIRCLE-ANTIQUE-SCIENTIFIC-TOOL-PATENT-ENGRAVING-1832-/141431053053" rel="nofollow">https://www.ebay.com/itm/EDWARD-TROUGHTON-REFLECTING-CIRCLE-ANTIQUE-SCIENTIFIC-TOOL-PATENT-ENGRAVING-1832-/141431053053</a>[/QUOTE]</p><p><br /></p>

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