J & L

OPTICAL COMPARATORS IN WHICH ENLARGED IMAGES AND PROFILES OF WORK PIECES ARE PROJECTED UPON SCREENS FOR EXAMINATION OR COMPARISON WITH A STANDARD, OPTICAL MEASURING MACHINES IN WHICH ENLARGED IMAGES AND PROFILES OF WORK PIECES ARE PROJECTED UPON SCREENS AND MOVED WITH REFERENCE TO FIDUCIAL LINES THEREON TO DETERMINE DIMENSIONS ON SAID WORK PIECES, AND ACCESSORIES THEREFOR COMPRISING FIXTURES FOR HOLDING, STAGING AND ORIENTING WORK PIECES FOR PROJECTION, PROJECTION SCREENS, PROJECTION SCREENS HAVING MASTER CHART OUTLINES MARKED THEREON, GLASS MEASURING SCALES, PHOTOGRAPHIC ATTACHMENTS FOR RECORDING IMAGES ON COMPARATOR SCREENS, COORDINATE MEASURING TABLES AND TRACING FIXTURES FOR INDIRECT PROJECTION OF CONTOURS