26 MICROSCOPES, TELESCOPES, CHRONOGRAPHS, BAROMETERS; SURVEYING INSTRUMENTS-NAMELY, LEVELS, LEVELING RODS, THEODOLITES AND PARTS THEREOF, AUTO-REDUCING TACHOMETER RODS AND PARTS THEREOF, PLANE TABLE PORTABLE FIELD SETS CONSISTING OF A CARRYING CASE HAVING AN ALIDADE, PLANE-TABLE, TRIBRACH, STAND, TOPOGRAPHICAL FOLDING STAFF, AND SURVEYING INSTRUMENT PARTS, PENTAGONAL PRISMS, GLASS SCALES; AND OPTICAL INSTRUMENTS-NAMELY, MAGNIFYING AND REDUCING LENSES, HUNTERS' RANGE FINDERS, CATHETOMETERS AND PARTS THEREOF, MICROSCOPE LAMPS AND PARTS THEREOF, PHOTOMICROGRAPHIC CAMERAS AND PARTS THEREOF, PLANE SURFACE TESTING INSTRUMENTS, AERIAL PHOTOGRAMETRIC SURVEYING CAMERAS AND PARTS THEREOF, MILITARY AIRCRAFT SURVEYING CAMERAS AND PARTS THEREOF, MILITARY OPTICAL INSTRUMENTS, NAMELY, RANGE FINDERS, TELEMETRIC INSTRUMENTS AND PARTS THEREOF AND CALCULATORS THEREFOR, PANORAMIC AND BALLISTIC CAMERAS AND PARTS THEREOF