Our country and its resources; . it is tuned ro receive thosewaves, other waves of other wave-lengths will not be heard in the re-ceivers of the operator. Thus it ispossible for several transmitting setsto be operating in one locality at thesame time, while the same number ofreceiving sets are receiving, eachfrom the desired transmitter, with-out interference from other trans-mitters. Tuned or syntonic wirelesshas reached a high degree of develop-ment to-day. although much remainsto be accomplished. After having developed their de-tectors to the highest possible de-gree of sensitiveness, wirel
Our country and its resources; . it is tuned ro receive thosewaves, other waves of other wave-lengths will not be heard in the re-ceivers of the operator. Thus it ispossible for several transmitting setsto be operating in one locality at thesame time, while the same number ofreceiving sets are receiving, eachfrom the desired transmitter, with-out interference from other trans-mitters. Tuned or syntonic wirelesshas reached a high degree of develop-ment to-day. although much remainsto be accomplished. After having developed their de-tectors to the highest possible de-gree of sensitiveness, wireless menwere confronted with the problem ofincreasing still farther the range ofreceiving apparatus. Solution wasfound in the introduction of ampli-fiers, or magnifiers of the weak cur-rents in the detector circuit. Someform of magnifiers are in reality anordinary telephone circuit, in thatthe receiver, connected to the de-tector, is capped over a microphonetransmitter, which in turn is elec-trically connected to a powerful bat-. 392 OUR (MINTKY AND ITS RESOURCES tery and another telephone the faint sounds of the tirsttelephone receiver are spoken intothe microphone, which in turn im-presses them n :i circuit contain-ing a loud-speaking receiver, or, ;itleast, a receiver that produces loudsounds in the ears of the forms of amplifiers utilize amodified form of the audion detec-tor. In the one-step amplifiers ofthis type, an amplification or mag-nification of from 6 to 10 times isattained; in the two-step amplifierfrom 60 to KM); and in the three-stepfrom (.no to 1,000, according to , the inventor of the audionamplifier. Thus it will be appreci-ated that the sensitiveness of thedetector is materially improved bythe use of an amplifier: and it isthe combination of highly sensitivedetectors and amplifiers more thananything else that accounts for theremarkable long-distance communi-cation of present-day wireless. TELEFHONV WITHOUT WIRES Wireles
Size: 1260px × 1983px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1917
