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; Etc |
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American Telegraphy and Encyclopedia of the Telegraph: Systems, Apparatus ... William Maver, Jr. No preview available - 2015 |
Common terms and phrases
adjusted 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 termed terminal terminal stations thereby ticker transmitter type-wheel vibration volts Wheatstone Wheatstone bridge wheel zinc
Popular passages
Page 273 - By this arrangement of fibres and springs it will be seen that any tendency of the coil 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. The Cuttriss recorder, as it appears in practice, is shown in Fig. 207. The permanent magnet is of nearly circular form. The letters in Fig. 207 refer to parts similarly lettered in Fig. 206. In the latest form of the Cuttriss recorder a small, curved iron cheek,...
Page 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.
Page 323 - TRANSMITTING AND RECEIVING CIRCUITS. RECEIVING APPARATUS. condenser is placed around the telephone to prolong the duration of the current impulses and to steady the oscillation of the mirror. A small incandescent lamp is caused to throw a beam of light on the mirror, which beam is reflected by the mirror through a slot in a cylinder within which is contained a moving roll of sensitized paper. When the system is in operation the beam or pencil of light is moved to the right or left, depending on the...
Page 335 - When electric waves are set up in the neighborhood of this circuit, electromotive forces are generated in it which appear to bring the filings more closely together, that is, to cohere, and thus their electrical resistance decreases, from which cause this piece of apparatus — the tube and its filings — is termed a "coherer.
Page 94 - The total resistance of a parallel circuit is equal to the reciprocal of the sum of the reciprocals of the individual resistances of the circuit.
Page 158 - R's lever, but, as now the western circuit is closed at #', the lever I is held forward by its armature. In this way the function of the repeater in keeping closed the opposite transmitter, and virtually also the circuit which is being " repeated '' into, is performed. Should the west now desire to " break " or send to the east, he opens his key, which action, by opening the local circuit of transmitter T at F, opens the eastern circuit at x. The east, finding his circuit now open, closes his key...
Page 436 - It may also be noted in this relation that quite a high degree of skill is required on the part of the operator of the Phelps and similar keyboards to secure the best results.
Page 365 - naught") is distinguished from the "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 apatite equivalent to that made between letters. CONVENTIONAL SIGNALS I <>l; FLAG) OB TORCH. NOTE.— Each station should have...
Page 556 - ... rhis 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.
Page 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...