. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . Fessenden Coinbiued Sending and Receiving 36. Fessenden. An American system designed by lleginald is shown in Fig. 36; it contains several novel features,as the use of a current-operated wave detector, invented by and termed by him a barretter. The tuning of the cir-cuits is accomplished by a grid formed of wires immersed in oilthat gives a variable capacity and inductanc
. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . Fessenden Coinbiued Sending and Receiving 36. Fessenden. An American system designed by lleginald is shown in Fig. 36; it contains several novel features,as the use of a current-operated wave detector, invented by and termed by him a barretter. The tuning of the cir-cuits is accomplished by a grid formed of wires immersed in oilthat gives a variable capacity and inductance without the use of 360 WIRELESS TELEGRAPHY 31. Pessenden Tuned 37. coils or condensers. By means of sliding contacts 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 comple
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