446 



KENNELLY, TAYLOR— PROPERTIES OF 



where Ot is the oscillographically recorded ampHtude, at a time t 

 seconds after release, when the initial amplitude is 0^ radians. 



Resistance 



Freq 



380 

 387 

 994 

 1000 

 1007 

 1013 

 1020 



Observations 

 Resist. React. 



ohm 



156.3 

 156.6 

 15 7.9 

 170.0 

 15 8,0 

 156.7 

 15 6.3 



ohm 



8.35 

 9.88 

 12.38 

 8.4 6 

 2.53 

 M8 

 6,44 



Defl. 



rod. 

 .0052 

 .0087 

 ,0157 

 .061 I 

 ,0209 

 ,0105 

 ,0044 



Calcu lations 



Max. T?esonance Impedance, \3.8ohms 

 Max. Resonance D€fiection,0,06 1 1 rod. 

 Current: Strength, 5.5-\0"^ampe.res. Tm.s 

 Qaadrantal Points at 33er^ar\d[005^ 

 N<atural Freqwency, |000.5/v. 



Current, Max. Cyc!. Value, 7.78-I0' jbsomp. 

 Mcix.V/b. Velocity, 3S3 rad/seo. 

 Log. Decrement A Z8-3 hnp^/sec. 



per second • J< / 



A, Torijwe Const, 2804 ^^3^ ;;;^ 



m, E^uiv. Moment of Inertia, 

 1.006 /O'^t^m-cm^ 



r, F?esistance Cons^. j ^^^^^ 

 5.697-10-^ -^37^ 



5, Elastic Const. 



397.5 J ^":/^ ^ 



DuDDELL Vibration GAUVANOMeTER 

 Fig. 19. Motional-Impedance, Velocity and Deflectional Circles. 



Fig. 19 shows two circular graphs starting from the common 

 origin O, for the Duddell galvanometer used, as tuned to 1000 /—'. 

 The circle OARB is the motional-impedance circle at impressed 



