. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . ntacts on the wires,the open-circuit oscillator may be tuned to the closed-circuit systemso that ])oth have exactly the same period. By referring to the diagram the arrangement will becomeclear. In this drawing the transmitter and receiver are combinedas they are in practice, since the same serial and earth wires servefor sending and indicating the waves. The aerial wire 1 is sup-plied with energy from the induct
. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . ntacts on the wires,the open-circuit oscillator may be tuned to the closed-circuit systemso that ])oth have exactly the same period. By referring to the diagram the arrangement will becomeclear. In this drawing the transmitter and receiver are combinedas they are in practice, since the same serial and earth wires servefor sending and indicating the waves. The aerial wire 1 is sup-plied with energy from the induction coil 2 through the spark-gap8; one side of the gap leads to the key 4, making connection withthe tuning grid wires 5; these can be adjusted by the sliding con-tacts G, i) finally leading to the earth at 11. The receiving devicescomprise a condenser 7 and a tuning grid 0 which connects withthe barretter 10 through a holder containing a number of them at17, an electromagnet automatically breaking the circuit in whichthey are placed by the operation of the induction coil; the resonatorcircuit is completed by antenna 1 and the earth 11; the variation 361 32 WIRELESS TELEGRAPHY. Diagram of DeForest Wireless-Telegraph 38. of the current is read by means of a telephone receiver 12. Theapparatus is very compact as Fig. 37 shows, it is rapid in operationand accurate in its translations. American De Forest. Another system using the telephonereceiver as a means of indication is the American De Forest. Thiswas the first commercial system to employ an alternating-currentgenerator and an oil transformer to charge the oscillator system. ■\iy_ ^ v^^H ■^H -, ►. ..„ . ■IW^ Ho * mM1^J^9I^ ^x^^^^Stm^^^^^f / ^^^SI^^^^^K^^^^^^^^B^^^k^r^ < J^^^\^B|^^^ / DeForest System 39. 362
Size: 2685px × 930px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidcyclopediaofappl00ameruof
