Beam compass

Claim 1

A BEAM COMPASS COMPRISING: A BASE PROVIDED WITH A SURFACE ENGAING FACE, SAID BASE ALSO INCLUDING AN UPSTANDING BOSS HAVING A BORE THERETHROUGH AND A SHELF EXTENDING OUTWARDLY THEREFROM IN SPACED RELATION TO SAID SURFACE ENGAGING FACE; A RING MEMBER SURROUNDING SAID BOSS AND ROTATABLY SUPPORTED IN A HORIZONTAL PLANE ON SAID SHELF; AN ANNULAR PLATE MEMBER HAVING A BORE THERETHROUGH REMOVABLY ATTACHED TO THE TOP SURFACE OF SAID BOSS, SAID PLATE MEMBER EXTENDING OUTWARDLY FROM SAID BOSS AND EXTENDING OVER SAID RING MEMBER THEREBY CONFINING SAID RING MEMBER ON SAID SHELF, THE BORE IN SAID PLATE MEMBER BEING IN SUBSTANTIAL ALIGNMENT WITH THE BORE IN SAID BOSS; A SOLID TRANSPARENT VIEWING CYLINDER SNUGLY POSITIONED IN THE BORE OF SAID BOSS AND EXTENDING UPWARDLY THROUGH THE BORE IN SAID PLATE MEMBER, SAID CYLINDER HAVING A CENTRALLY DISPOSED NEEDLE POINT WHEN EXTENDS DOWNWARDLY FROM ITS LOWER END PORTION OF ENGAGEMENT WITH A WORKING SURFACE; AN ARM MEMBER PIVOTALLY SECURED TO SAID RING MEMBER; AND CARRIAGE MEANS SLIDABLY POSITIONED ON SAID ARM MEMBER, SAID CARRAIGE MEANS INCLUDING CLAMPING MEANS FOR CLAMPING SAID CARRIAGE MEANS ON SAID ARM MEMBER AND FURTHER INCLUDING HOLDING MEANS FOR ENGAGING A TOOL IN A VERTICAL POSITION.