GAERTNER

SCIENTIFIC INSTRUMENTS-NAMELY, CATHETOMETERS, [CHRONOGRAPHS,] COLLIMATORS, COMPARATORS, COMPENSATORS, CREEPTEST EQUIPMENT, DIAPHRAGMS, DILATOMETERS, [DIVIDING MACHINES, ECHELONS,] ELLIPSOMETERS, FILTERS, [HELIOSTATS], INTERFERENCE APPARATUS, LENSES AND EYEPIECES, LEVELS AND LEVEL TESTERS, LIGHT SOURCES AND ILLUMINATORS, [METER BARS], MICROMETERS, MICROSCOPES, MIRRORS, MONOCHROMATORS, OBJECT HOLDERS, OPTICAL BENCHES, CARRIAGES, SLIDES, AND ACCESSORIES, OPTICAL VIBRATION MEASURING EQUIPMENTS, PHOTOMETERS, POLARISCOPES, REFRACTOMETERS, SCREENS, SLIDES, SLITS SPECTROGRAPHS, [SPECTROMETERS,] SPECTROSCOPES, SPHEROMETERS, [SPECTRUM TUBES,] THERMAL EXPANSION INSTRUMENTS, [THERMOMETERS] AND BURETTE READERS, [THERMOPILES, TIME MARKERS, VISCOMETERS,] WAVE PLATES, SUPPORTS, STANDS, CLAMPS, HOLDERS, ADAPTORS, ADJUSTING PLATES, AND EQUIPMENT THEREFOR