at the total sola?- Eclipse in 1882. 



47 



round until its edges abut, forms the reflecting surface of the 45° 

 mirror is specified by the following construction. 



On a sheet of paper, or on the silvered sheet of metal, describe 

 from the same centre two circles with radii of 7 '07 and 



Fig. 5. Geometrical construction of Reflector used. 



7"07 — 2 - 83 = 4*24 inches respectively. The circumference of 

 the greater circle is 44'44 inches. The upper rim of the 45° 

 reflector has a radius of 5 inches, therefore its cix-cumference 



