TIIKORV or Jill: IIOWLIXG TEIJil'IIONE 



33 



the following eiiipirical cciuatioii would represent approximately the 

 relation between //, / and s, nanielv 



32 + : 



h = 



(2.6 + 2C + I) (/+.03) 



(12) 



where z is expressed in microns and / in amperes e in volts and h 

 in ohms per micron. To facilitate solving for z when h and / are 

 given, a set of curves showing this relation is given in Fig. 3. It 

 is this modulation factor h which measures the efficiency of the trans- 

 mitter button. 



120 



110 



_ 100 



£ 90 



"S 80 



I 70 



J 60 

 o 

 ^ 50 



o 40 



CO 



> 20 



10 



34 56789 10 

 VALUES OF Z (MICRONS) 



Fig. 3 



12 13 



It is also necessary to know* the dependence of T upon z and /. 

 To obtain this relation corresponding values of e and V, the DC 

 drop across the transmitter as measured by direct current measuring 

 instruments, w'ere obtained for various degrees of agitation and 

 amounts of direct current. Four transmitters were used in establish- 

 ing the relation, the results being shown in Fig. 4. Then, for any 

 value of the supply current I a \'alue of T can be obtained from V. 

 From the corresponding e a value of h and z can be obtained from 

 equations (10) and (11). In this way the relations shown in Figs, o 



