370 KENNELLY-NABESHIMA— ALTERNATING CURRENT. 



m Vector voltage transmission coefficient' at junction 



(numeric Z). 



M Magnetic permeability (gausses/gilberts-per-cm.). 



n Vector current transmission coefficient (numeric Z). 



also the number of single wave passages over a line per 



second (numeric/sec.) 



P = Pf -\- Pm Total average power at sending end of a line in transient 



state (watts). 



Pc, Pm Average power of transmitting electric flux and magnetic 



flux along line, at A (watts). 



TT = 3.1415 . . . (numeric) . 



R Total resistance of a line (ohms). 



r Linear resistance of a line (ohms/w. km.). 



0" Impedance of load at B (ohmsZ). 



T Time of transit of waves along line from A to B, or B to A 



(seconds). 

 T^ Time of transit of waves along line from ^ to P (seconds). 

 Tp,, Tp2, Tpic Time of transit of first, of second and of ^th wave reflec- 

 tion from B to P (seconds). 

 t Time elapsed from switchclosure at A (seconds). 



V Velocity of propagation of waves along line (km./sec). 

 w, wk Growth coefficient of waves at point P in transient state, 



coefficient after ^th reflection (numeric Z). 

 We, Wm Volume energy in dielectric of electric flux and of magnetic 



flux (ergs/c.c). 



X = £w Total reactance of line (ohms). 



X Linear reactance of line (ohms/w. km.). 



Y Total admittance of line (mhosZ). 

 Z Total impedance of line (ohmsZ). 

 s^ Surge impedance of line (ohmsZ). 



Zp:,Zpa Impedance at and beyond a point in a line after ^th reflec- 

 tion from B, and in steady state (ohmsZ). 



w Impressed angular velocity (radians/sec), 



logh Hyperbolic logarithm, or logarithm to Napierian base, 



hyp Hyperbolic radian, 



w. km. Wire kilometer, 



r.m.s. Root mean square. 



\E\ Size of complex E. 



