Patent ID: 8011109
Filing Date: 2011-09-06
Classification: G01C

Abstract:
1. In a level of the type having an elongate hollow frame including two sidewalls each defining axially aligned vial openings into the frame, the improvement comprising a vial casing secured with respect to the frame and defining a hermetically sealed single-cavity casing interior entirely enclosing a liquid-and-bubble vial with a substantially cylindrical outer surface extending between two vial ends, the casing being formed of two opposite round face-walls and a surrounding cylindrical wall therebetween which has (a) a pair of opposed major wall-portions of first thickness and (b) a pair of opposed intervening wall-portions of second thickness greater than the first thickness, each intervening wall-portion defining a recess which snugly receives a corresponding one of the vial ends, the inner surface of the surrounding wall being smooth and substantially free of light-ray-interfering structures, whereby the vial appears embedded in the surrounding wall and the face-walls provide uninterrupted full views of and about the cylindrical vial.