I 



OLIll-.R lll-.insiDE 351 



. . . To gi't larjjc inductance with small resistance, or, more gen- 

 iT.ill\ , to make coils havinK large time constants, re(|uires the use 

 of plenty of copper to get the conductance, and plenty of iron to 

 get the inductance, employing a properly closed magnetic circuit 

 profxrly di\ ided to prevent extra resistance and cancellation of th« 

 increased inductance . . . This plan ... is a straightforward 

 way of increasing the L largely without too much increasing the 

 resistance and may be worth working out and de\elopment. But 

 I should add that there is, so far, no direct evidence of the beneficial 

 action of inductance brought about in this way." 



In "Klectrical Papers," \'oI. II. p. 'M\. he tieals with rctlected 

 wa\es. and on page 347 he sa\s: 



"... but the transmitter and the recei\ ing teleplionc distort 

 the proper signals themselves. The distortion due to the electrical 

 part of the receiver may, however, be minimized by a suitable 

 choice of its impedance. 



"Klectromagnetic Theory," \'ol. I, p. 404: — 



"We have seen that there are four distinct ciuantities which 

 fundamentalh' control the propagation of 'signals' or disturbances 

 along a circuit, symbolized by R, K, L, and 5, the resistance, 

 external conductance, inductance, and permittance;" 



"Klectromagnetic Theory," \'ol. I, p. 411 : — 



"It is not merely enough that signals should arri\c without being 

 distorted too much; but they must also be big enough to be useful 

 . . . Nor can we fix any limiting distance by consideration of dis- 

 tortion alone. And even if we could magnify very weak currents, 

 say a thousandfold, at the receiving end, we should simultaneously 

 magnify the foreign interferences. In a normal state of things 

 interferences should be only a small fraction of the principal or 

 working current. But if the latter be too much attenuated, the 

 interferences become relatively important, and a source of very 

 serious distortion. We are, therefore, led to examine the influence 

 of the different circuit constants on the attenuation, as compared 

 with their influence on the distortion." 



"F^lectrical Papers," \'ol. II, p. 402: — 



"I was led to it (the distortionless circuits), by an examination 

 of the effect of telephones bridged across a common circuit (the 

 proper place for intermediate apparatus, remo\'ing their impedance) 

 on waves transmitted along the circuit." 



