Deviates a collimated light beam from 0.0 through a max of approx 1000.0 sec of arc for 5461 a light; base w/knob deviates light in azimuth, rotate housing 90.0 degrees to the other base to deviate in an elevation plane; aperature 3.750 in dia; wedge scale grad in degrees full circle; reticle scale grad in min through 1.0 deg; angular direct reading of 1.0 min; matl wedges glass, jan-g-174, bsc-2, 517-645 gr a
