J 36 KENNELLY-TAYLOR— EXPLORATIONS OVER [April 22, 



r= Distance along a radius (cm.), 

 p:=: Density of diaphragm material (gm./cm.^), 

 p' = Superficial density of diaphragm (gm./cm.^), 

 ^ = Elastic force of diaphragm per centimeter of displacement, 



referred to equivalent mass (dynes/cm.), 

 o-=Poisson's ratio for material of diaphragm (numeric), 

 2 = Sign of summation, 



t = Time elapsed from a given epoch (seconds), 

 ^=: Azimuth angle measured on surface of diaphragm (radians) 

 vmf. = Vibro-motive force (dynes) Z, 



I^ = Initial displacement in a vibratory motion (cm.), 

 zv and Wo = Amplitude of a point on surface of diaphragm for fun- 

 damental mode of vibration (cm.) Z , 

 w,. = Amplitude of vibration of a point at radius r from center of 



diaphragm (cm.) Z, 

 w„ = Instantaneous amplitude of vibration (cm.), 

 Wmax = Maximum cyclic amplitude at center (cm.), 



w= Vibratory velocity at center of diaphragm (cm./sec.) Z, 

 w=: Vibratory acceleration at center of diaphragm (cm./sec.-) Z , 

 w, = Statical displacement of center of diaphragm (cm.), 

 ix = i(mu> — s/o)) "Mechanical reactance" of vibrating diaphragm 

 (by analogy to alternating-current theory) {dynes/(cm./ 

 sec.)} Z, 

 2 = {r-\-ix) "Mechanical impedance" of vibrating diaphragm 

 (by analogy to alternating-current theory) {dynes/ (cm./ 

 sec.)} Z, 

 oj ^ 27rn ::= Angular velocity of vibratory motion (radians/sec), 

 ojq ^ 27rMo = Angular velocity at resonance (radians/sec), 

 00 = Infinity, 



Z = This sign after a unit indicates a " complex quantity," 

 .—' = Cycles or vibrations per second (cycles/sec). 



