A GOVERNOR FOR TELEPHONE DIALS 1275 



friction-centrifugal go\'crnors but each particular governor will have 

 different terms in the values for ^, h and q. The theoretical e(iuation of 

 motion can be used to calculate the speed of the dial at any time, t, 

 after the critical velocity is reached or the time required to reach any 

 given speed once the governor studs touch the case. The equation shows 

 that for large values of t, u approaches q, so that steady state speed is 

 given by the value of q for each type governor, and is in terms of the 

 operating ^'alues and design constants of the mechanism. 

 For the drive-bar governor the steady state speed equation is 



0} = q = i / ^(^ ~ ^g) + ^Mcoo' - nrjG/e ^^^ 



Mn 



THEORETICAL SPEED-TIME CURVES 



Drive-Bar Governor 



The design constants and physical data given in Table I apply to the 

 drive-bar governor, and were used to calculate the theoretical speed 



Table I — Refer to Figs. 3 and 4 



* Appendix II — Governor Input Torque. 



versus time curve shown in Fig. 6. The dial governor is initially adjusted 

 so that signaling is at the rate of 10.0 pulses per second, requiring a steady 

 state governor shaft velocity of 125.6 radians per second. This steady 

 state velocity was used to determine the critical velocity coo by substitut- 

 ing the values in Table I in equation (10) : 



coo = 121.8 radians /second 

 and from equations (3), (4), (5), and (6) 



g = 0.606 h = 9,520 h/q = 75.9 A = 72.7. 



