



in 



value of thin constant, in terms of a and 6, can In 

 general bo f<mi<l moat cattily by making the proper trans- 



it.-H itjM.n the equation of the hyperbola 



Tlu new x-axis makes the angle 0, the new y-axis the 

 angle 0', with the old r-axis, such that 



h 



sin ^ sin ^ = 



>, ,- F //* 



and 



tlu-ivfon- tin- formulas fl2. r ] fr trans formation, 



x ^ cos ^ -f y 7 coe ^, ysx 1 sin ^ + / sin ^, 

 become in this case 



(4) 



