268 



BRADLEY M. PATTEN 





Fig. 24 Diagrams constructed after the method shown in figure 23; a, for 

 16f per cent difference, constructed angle of sensitive surfaces = 82 degrees; b, for 

 25 per cent difference, constructed angle = 83 degrees; c, for 33^ per cent differ- 

 ence, constructed angle = 83 degrees; d, for 50 per cent difference, constructed 

 angle = 82 degrees. 



