Our country and its resources; . s succeed-ing in communicating over a rangeof several hundred miles. In Amer-ica. Dubillier, Collins. DeForest andother investigators have in the pastdevoted considerable attention to thearc generator with a fair degree ofsuccess. Outside of the microphone, whichmust he able to handle large vol-umes of current without injury, ina wireless telephone set the arc gen-erator is the center of interest: andlikewise it is true that the generatoris the point of divergence between the various systems. The .lanke system,for instance. Is a variation of thePoulsen arc. in
Our country and its resources; . s succeed-ing in communicating over a rangeof several hundred miles. In Amer-ica. Dubillier, Collins. DeForest andother investigators have in the pastdevoted considerable attention to thearc generator with a fair degree ofsuccess. Outside of the microphone, whichmust he able to handle large vol-umes of current without injury, ina wireless telephone set the arc gen-erator is the center of interest: andlikewise it is true that the generatoris the point of divergence between the various systems. The .lanke system,for instance. Is a variation of thePoulsen arc. in that the arc is placedin liquid alcohol to insure greatersteadiness. To impress the voice onthe high frequency current, a specialwater-cooled multiple microphone isused. The TYK system, on theother hand, is not an American sys-tem like the former, hut a Japanesesystem developed by Torikato. ItsChief value lies in its utmost sim-plicity. The system consists of a500-volt arc between points of burntmagnetite and brass, shunted by a. 394 OtJR COUNTRY AND ITS RESOURCES circuit with a rather Large capacityand a small inductance. A heavy-cur-rent microphone is placed in scrieswith the aerial. Although it is sup-posed that the TYK system is re, ll.\an arc system, the inventor is ofthe opinion that the result producedis a quenched spark of spark fre-quency beyond the limit of audibil-ity. By a quenched spark is meant;i discharge that does not oscillateto any appreciable extent: in otherwords, the discharge rapidly diesout or it is highly damped. Various quenched spark systemshave also been tried, notably that ofDitcham, hut as a general thingsystems based on the use of quenchedspark generators do not possessgood speech quality. The speechquality of the TYK system is re-ported to be poor, which confirms,to some extent, the helief that itsgenerator is a form of quenchedspark gap. High frequency alternator sys-tems have been used as far hack asL906 by Fessenden, hut as in thecase of their
Size: 1249px × 2000px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1917
