. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . With the new transmitter it is not nec-essary that the antenna system be tunedto the primary, nor even Ik- substantiallyir. tune with it. The wave length transmitted may he varied in a simple mannerb\ moving a contact switch operated fromthe front of the transmitter case. Afterthe person desiring to communicate withthe nearest fixed station has once set thisswitch, he has no further tuning to do. A small light connected with the lis- April, 1915. RAILWAY AXD LOCOMOTIVE ENGINEERING. 119 tening
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . With the new transmitter it is not nec-essary that the antenna system be tunedto the primary, nor even Ik- substantiallyir. tune with it. The wave length transmitted may he varied in a simple mannerb\ moving a contact switch operated fromthe front of the transmitter case. Afterthe person desiring to communicate withthe nearest fixed station has once set thisswitch, he has no further tuning to do. A small light connected with the lis- April, 1915. RAILWAY AXD LOCOMOTIVE ENGINEERING. 119 tening switch indicates whether the lat-ter is set for talking or listening. Whenit is up, the light is lit, and he may listento the person talking from the fixed sta-tion. When it is down the light is out,and talking may be done. Transmission is effected by means of an so recently become a commercial possi-bility. The first trials concerned themselveswith the receipt of messages on a train,and not with transmission from it. Itwas found possible in the preliminarywork to transmit from the fixed station. THE TELEPHONE APPARATUS AT A FIXKD STATION. alternating curent of 6,000 cycles. It isbrought from the turbine-alternator by apair of train connectors to the rear end ofthe coach next following the mail-and-baggage car. In order to provide for theregulation of the voltage and the input ofpower, two leads are brought into thetelephone booth. The telephone instrument as a wholeconsists of an upper part devoted to trans-mission, and of a lower part where arelocated the tuning apparatus necessary tothe receiving arrangements. Essential parts of the equipment arewhat are known as the Audion detectorand the Audion amplifier. The functionof the latter is to intensify the voice pulsa-tions. It is said to be possible with thisinstrument to secure an intensification ofsixty fold. There is no derangement ordistortion of the vocal vibrations. Theirgeneral qualities are faithfully preserved,but the
Size: 1986px × 1258px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidrailwaylocom, bookyear1901
