Abstract: A method and apparatus for measuring surface irregularities on articles such as curved automotive glass are provided wherein two contact points on a sensor head establish a chord at a segment of the surface and a probe measures the distance of the surface from the chord between the contact points, thereby permitting calculation of the local radius of curvature as the surface is scanned.

Abstract: An interlayer material is scanned prior to laminating same with glass sheets to generate a thickness variation signal, a wedge angle signal and an optical power signal. The signals are then selectively filtered to determine the thickness variation, wedge angle and optical power of the interlayer after lamination.

Abstract: An interlayer material is scanned prior to laminating same with glass sheets to generate a thickness variation signal, a wedge angle signal and an optical power signal. The signals are then selectively filtered to determine the thickness variation, wedge angle and optical power of the interlayer after lamination.

Abstract: An interlayer material is scanned prior to laminating same with glass sheets to generate a thickness variation signal, a wedge angle signal and an optical power signal. The signals are then selectively filtered to determine the thickness variation, wedge angle and optical power of the interlayer after lamination.

Abstract: Apparatuses for attenuating a body of hot glass moving over a body of molten metal are each provided with a nip sensing device, a linear movement monitoring device and an angular movement monitoring device. The nip sensing device includes a plurality of discrete phototransistors positioned over the glass and molten metal in a direction generally transverse to the direction of glass movement. When the selected ones of the phototransistors are not conducting, the circuit operates to appropriately energize a motor to move the attenuating apparatus with respect to the edge of the ribbon to provide a nip width within a predetermined range. The linear movement monitoring device includes a potentiometer on each opposed attenuating apparatuses giving an output which is monitored to determine the width of the ribbon. The angular movement monitoring device includes a potentiometer which yields an output which varies with the movement of the apparatus along an arcuate path relative to the edge of the ribbon.