Special Features:

3 grooves parallel to ea other 0.125 in. Apart 1.250 in. Long, center groove centered in ad bisecting window, grooves filled in w/black printers ink, periphery of one surface indented 0.062 in. Deep

Properties:

A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.