Science. 



N. S., Vol. IX., Plate II. 



Fig. 1. Belt plate, etc. 



Fig. 4. Acljvistmeiit for transverse space waves. 



.1 



Fig. 5. Adjustment for compounding circular and 

 plane polarized vi^aves. 



Fig. 2. Cam a.xles with one, two and three wave- 

 lengths. 







^u 



FfG. 3. Adjustment for plane polarized waves. Fig. 0. Adjustment for rotary polarization. 



B.4RUS ON Harmontc Motion. 



