American Telegraphy and Encyclopedia of the Telegraph: Systems, Apparatus, Operation: Embracing Electrical Testing; Primary and Storage Batteries; Dynamo Machines; Morse, Duplex, Quadruplex, Multiplex, Submarine, Automatic, and Wireless Telegraphy; Burglar-alarm, Fire-alarm, and Police-alarm Telegraphy; Printing Telegraphy; Military and Naval Signaling; Railway Block Systems; Telegraph Wire, Cables, and Conduits; EtcMaver publishing Company, 1903 - 656 pagine |
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American Telegraphy and Encyclopedia of the Telegraph: Systems, Apparatus ... William Maver Visualizzazione completa - 1909 |
American Telegraphy and Encyclopedia of the Telegraph: Systems, Apparatus ... William Maver (jr.) Visualizzazione completa - 1903 |
American Telegraphy and Encyclopedia of the Telegraph: Systems, Apparatus ... William Maver, Jr. Anteprima non disponibile - 2015 |
Parole e frasi comuni
adjusted alarm ampere apparatus armature lever arrangement artificial line automatic binding posts break-wheel cable capacity caused cell central office circuit closed coil condenser conductor connected contact points core current strength cylinder deflection depressed device disc dots duplex dynamo machine electric electro-magnet electromotive force employed figure galvanometer ground inch indicated inductance induction coil instrument insulated iron letter line wire lines of force local battery loop magnet main line metal mile needle negative neutral relay normally Ohm's law ohms operation paper paper tape passes placed plate polarized relay pole pole-changer position potential practically pulsations quadruplex receiving repeating result reversals rheostat rotation screw segments semaphore shaft short-circuited shown in Fig shunt side signal box siphon recorder sounder strength of current strip switch tangent galvanometer telegraph system telephone terminal terminal stations thereby ticker transmitter type-wheel vibration volts Wheatstone Wheatstone bridge wheel zinc
Brani popolari
Pagina 273 - A to place itself at a right angle to the permanent magnets will deflect the siphon to the right or left, as the case may be, of the imaginary zero.
Pagina 366 - A until acknowledged. Each station will then turn on a steady flash and adjust. When the adjustment is satisfactory to the called station, it will cut off its flash, and the calling station will proceed with its message.
Pagina 365 - T" dash by a slight pause at the lowest point of dip, and with this exception there will be no pause whatever between the motions required for any single letter. A slight pause will be made between letters. At the end of each word, abbreviation, or conventional signal, the space signal, or "front" motion, is made, preceded and followed by a pause equivalent to that made between letters. CONVENTIONAL SIGNALS FOR FLAG OR TORCH. NOTE — Each station should have its characteristic signal or call letter,...
Pagina 165 - Consequently, when the left-hand transmitter is open, as in figure, the circuit of the left-hand coll of the extra magnet of the eastern relay is open at the left-hand post of the western transmitter, and as a result thereof that extra magnet is magnetized by the current passing through the right-hand coil, and hence the armature lever of that relay is held against its front stop. Thus, for example, when, as in the figure, the west sends to the east, and thereby opens his key, the western relay in...
Pagina 181 - ... north pole of one magnet will attract the south pole of another, and the south pole of one will attract the north of another ; but the north...
Pagina 23 - As already staled, a number of voltaic cells joined together is termed a battery. CELLS IN SERIES. — When it is desired to obtain a greater electromotive force than that developed by one cell, a number of cells are connected, as in Fig. 13; the positive pole of the first cell being connected to the negative pole of the second cell; the positive of the second cell to the negative of the third cell, and so on. FIG. 13. Cells thus placed are said to be arranged in series. When thus arranged, the electromotive...
Pagina 556 - ... process will be performed four times. If the wire appears black after the fourth immersion, it shows that the zinc has not been all removed, and that the galvanizing is well done ; but if it has a copper color the iron is exposed, showing that the zinc is too thiu.
Pagina 323 - When the system is in operation the beam or pencil of light is moved to the right or left, depending on the direction of the current...
Pagina 156 - R' also closes, consequently, so does T*; this action closes EM, and the lever of that instrument is withdrawn from its position against the lever R. This releases R'S lever, but, as now * See Transmitter, (continuity preserving) Duplex Telegraphy.
Pagina 366 - To start the sending station after breaking. — Signal " GA," followed by the last word correctly received; the sender will immediately resume his message, beginning with the word indicated by the receiver. If nothing has been received, signal "RR;" the sender will then repeat all.