Image from page 387 of "The Bell System technical journal" (1922)
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ty and high electric fieldand tend to catch up with the main body. Thus the same effect whichlengthens wave C acts to shorten wave D. C. Herring has been able to obtain mathematical solutions for the appro-priate equations bearing on the matters just discussed. His theory is pre-sented elsewhere in this issue. ,^60 BELL SYSTEM TECIIMCM. JOl RXAL The delay feature discussed in connection with I*igs. 1 and 8 indicatesinteresting possibihties of using germanium filaments as delay or storageelements. 5. Ilri-, rifi;()Kv OF iiik Ili. \.\ii;ntakv Tkansistok In Fig. 9 we show a transistor with a Illamentary structure.* Modula-tion is achieved in this case by injecting holes at the emitter point whichflow to the right and modulate the resistance in the outi)ut branch betweenemitter and collector. Structures of this sort can be produced by the sand-blasting technique discussed in Section 2. The enlarged ends, which give the U INPUTA-C BASE,blb EMITTER, € ,, COLLECTOR,C ^xxxx-x-^x-xxVy-. Jl.I
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(a) FILAMENTARY TRANSISTOR EMITTER,f o Rb3ASE , b 0—\f\J\, VOLTAGEGENERATOR
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