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apparatus for testing the horizontal plane, as well as for determining small angles. W. is a bar with a strengthened its ampoule filled with alcohol or ether (except for a small gas bubble). At the bottom horizontal plane U. bubble is in the middle of ampoules. Apply to NU two ampoules for simultaneous inspection horizontality of two mutually perpendicular planes. There W. executed in the form of a cylindrical box, hermetically closed glass top, polished inner surface of the sphere, a box is also filled with a liquid with bubbles. In the horizontal position foundation boxes bubble located in the center of the glass cover. 

In the engineering and applied metal frame measuring UA in the cabinet bench U. anchored ampulla with the scale and adapt to the regulatory provisions on the grounds ampoule body. By the end of the bubble position on the scale is determined by the angle of inclination of the plane, which is U. For installation on a cylindrical surface of W. at the base of the shell a prismatic recess. U. Frame is a rectangular frame with a precise right angles, at the bottom of which the bulb and adjustable devices. U. Frame can be mounted in the horizontal and vertical surfaces. 

UA with one or two ampoules used in the construction of the right to control the position of the erected buildings and structures. 

UA is an important part of astronomy, geodesy, physical and other tools and devices used for homogenization, determination of angles of horizontal axes, taking into account the change of angle between the vertical axis and the line of sight, etc. To measure the angles on the ampoule astronomical W. scale marked with the price of division is usually 1'-1''

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