76 



Reflective Goniometer. 



BEFLECTIVE GONTOMETEK. 



Fig. 1. 



Inches 

 Scale of one foot. 



continued beneath I-I, posteriorly one inch deep to the center square 

 bolt N. A vernier or nonius DD, of silvered brass is attached to 

 AA, hall way up anteriorly, graduated in minutes corresponding to 



