Electric Wiring: A Textbook of Applied Electricity for Vocational and Trade SchoolsMcGraw-Hill Book Company, 1924 - 361 стор. |
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annunciator system armature automatic buttons battery system battery wire bell system binding post Binding Screws burglar alarm cable ceiling outlet circuit shown close the circuit conductors conduit connected in series consists constant-ring box contact springs cord circuit current flows Cut-Out diaphragm direct current double-contact buttons drop Dry Cells electrolier surface switch electrolier switch electromagnets Explain the operation fastened fixture flush switch four-way surface switch four-way switch hook switch induction coils installed insulated intercommunicating system joint knife switch lever switch LIGHTS CONTROLLED line wire located magneto system main wire method open circuit plug push button Questions receiver relay remaining terminal repeating coil return-call system ringer ringing ringing circuit section wire short circuit shown in Fig shunted single-contact buttons single-pole switch soldering copper source of current splice switchboard tap wire tape telegraph telephone three-way switches three-wire transmitter two-circuit electrolier two-wire Vibrating Bells voltage Western Electric wrapped
Популярні уривки
Сторінка 3 - Must be so spliced or joined as to be both mechanically and electrically secure without solder. The joints must then be soldered, to insure preservation, and covered with an insulation equal to that on the conductors.
Сторінка 210 - Main or Feeder run exposed. Branch Circuit run concealed under Floor. Branch Circuit run concealed under Floor above. Branch Circuit run exposed. -»- - Pole Line.
Сторінка 210 - Push button outlet. Numeral indicates number of pushes. Annunciator. Numeral indicates number of points. Speaking tube. Watchman clock outlet. Watchman station outlet. Master time clock outlet. Secondary time clock outlet. Door opener. Special outlet for signal systems, as described in specifications.
Сторінка 210 - Battery outlet. Circuit for clock, telephone, bell or other service, run . under floor, concealed.
Сторінка 55 - C', C", etc., of the ^ 19< cells A, A', A", etc., are connected, as are the zinc elements B, B', B' , etc. The copper terminal and the zinc terminal of cell A are connected to the line. With this arrangement the effective EMF is that of one cell, but the current giving capacity is equal to that of one cell multiplied by the number of cells.
Сторінка 238 - The first phonograph; improving the telegraph so that six messages can be sent over the same wire at the same time...
Сторінка 141 - No. 51 a, and the outer surface must be thoroughly slicked down. This wire is for use outdoors, where moisture is certain and where fireproof qualities are not necessary.
Сторінка 47 - ... inches. In no case shall signaling wires be run in the same tube with electric light or power wires. p. Transformers or other devices for supplying current to signaling systems from light, heat or power circuits must be of a design expressly approved for this purpose. The primary wiring must be installed in accordance with the rules for " Class C," and the secondary wiring in accordance with
Сторінка 3 - ... in contact with electric light or power wires. 6. Provided with petticoat insulators of glass or porcelain. Porcelain knobs and rubber hooks are prohibited. 7. So spliced or joined as to be both mechanically and electrically secure without solder. They must then be soldered to insure preservation, and covered with an insulation equal to that on the conductors. The following formula for soldering fluid is approved: Saturated solution of zinc . . 5 parts. Alcohol . . . . . . 4 parts. Glycerine...