Engineering topics
Publications and source records attributed to Marquis, S..
Lead crosshairs embedded in detachable, radiolucent intensifier faceplate offers quantitative measurement for X-ray image intensifier. Faceplate provides x-y reference system external to device being photographed.
Gage consists of upper plate and lower plate connected by aluminum post marked with metric scale. Upper plate is identical to calibration plate except for post flange. Lower plate is made of aluminum and is grooved for x-y coordinates and pattern of concentric rings that aid in recognition and measurement of nonlinearity. X-y coordinates on upper and lower plates match exactly. Gage indicates amount and direction of skew in images.