Babinet Compensator

The instrument consists of two round scales. One with index and the other with vernier. The first scale (index scale) is for turning the analyzer into the azymuth. The second scale (vernier scale) is for measuring the degree of orientation of a wedge box. The wedge box contains two wedges cut in mutually perpendicular direction of optics axis in quartz. The long wedge is movable by means of a micrometer screw minimum reading of the movement is taken. Micrometer screw minimum reading 0.001 cm. 1291 (a) Without Quarter Wave Plate 1291 (b) With Quarter Wave Plate