. Practical wireless telegraphy; a complete text book for students of radio communication . at in a polarized relay, the deflection for a given magnetizingcurrent is accordingly increased. 151. Microphonic Relays or Sound Intensifiers.—A microphonic relay hasbeen developed for intensifying the currents flowing in the local circuit of a wire-less telegraph receiver, but owing to the difficulty experienced in maintaining theinstrument in a permanent state of adjustment, it has not been commerciallyadopted. A working idea of the relay may be obtained from diagram, Fig. 196, wherein the tele-phone
. Practical wireless telegraphy; a complete text book for students of radio communication . at in a polarized relay, the deflection for a given magnetizingcurrent is accordingly increased. 151. Microphonic Relays or Sound Intensifiers.—A microphonic relay hasbeen developed for intensifying the currents flowing in the local circuit of a wire-less telegraph receiver, but owing to the difficulty experienced in maintaining theinstrument in a permanent state of adjustment, it has not been commerciallyadopted. A working idea of the relay may be obtained from diagram, Fig. 196, wherein the tele-phones are removed from the local circuit of a given receiving set and the microphonicrelay winding W substituted. Immediately in front of the magnet is placed a diaphragmwhich may be tuned mechanically to the spark frequency of the transmitter. The diaphragm carries the carbon button A; the second carbon button B is attachedto an adjustable screw, the two buttons being placed in light contact with eachother. A local battery of VA to 6 volts is joined in series with the microphonic contact. 170 PRACTICAL WIRELESS TELEGRAPHY.
Size: 2187px × 1143px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
