| GENERAL CHARACTERISTICS ITEM DESCRIPTION | RANGE 190 NM TO 24 MICRONS WITH QUICK INTERCHANGE GRATINGS,MIN. BANDPASS 0.25 NM WITH 2400 1/MM GRATING,RECIPROCAL DISPERSION 3.2 NM/MM FOR 2400 1/MM GRATING,FOCAL LENGTH-125 MM,WAVELENGTH READOUT DIAL RANGE-0 TO 1000 NM WITH 1200 1/MM GRATING,WAVELENGTH DIAL RANGE 0 TO 1000 NM WITH 1200 1/MM GRATING,WAVELENGTH DIAL ACCURACY-DIAL IS ADJUSTABLE,MOUNTING BY 1/4-20 TAPPED HOLE IN BOTTOM CENTERED BETWEEN SLITS BY FOUR 4-40 TAPPED HOLES IN BOTTOM OR ON FOUR RUBBER FEET |