The top surface of the polygon is polished to permit the user to autocollimate from this surface for precise positioning of the polygon axis. Coating Aluminized, and overcoated Material Fused quartz Angle Between Faces 30 degrees Accuracy 5 seconds. Shipping Weight 5 lbs NOTE 1. Angular dimensions for normals to reflecting surfaces are held to 5 seconds of arc. Pyramid error of any face with respect to other faces does not exceed 8 seconds of arc.
Polygons having higher accuracies are available.
Calibration sheets are included giving readings between adjoining faces and from degrees to all faces. Calibration is valid when the faces are parallel to the axis of rotation within 10 seconds.