pitch
    timbre
Chloride of silver cell
Closed-circuit cells
Closed-circuit impedance coil
Common-battery telephone sets
Condensers
    capacity
    charge
    conventional symbols
    definition of
    dielectric
    dielectric materials
    functions
    means for assorting current
    sizes
    theory
Conductivity of conductors
Conductors, conductivity of
Conventional symbols
Cook
    air-gap arrester
    arrester
    arrester for magneto stations
Crowfoot cell
Current supply to transmitters
    common battery
        advantages
        bell substation arrangement
        bridging battery with impedance coils
        bridging battery with repeating coil
        current supply from distant point
        current supply over limbs of line in parallel
        Dean substation arrangement
        double battery with impedance coil
        Kellogg substation arrangement
        North Electric Company system
        series battery
        series substation arrangement
        Stromberg-Carlson system
        supply many lines from common source
            repeating coil
            retardation coil
  local battery

D

Dean
  drop and jack
  receiver
  wall telephone hook
Desk stand hooks
  Kellogg
  Western Electric
Dielectric
Dielectric materials
  dry paper
  mica
Differential electromagnet
Direct-current receiver
Drainage coils

E

Electric lamp signal
Electrical hazards
Electrical reproduction of speech
  carbon
  conversion from sound waves to vibration of diaphragm
  conversion from vibration to voice currents
  conversion from voice currents to vibration
  cycle of conversion
  detrimental effects of capacity
  early conceptions
  electrostatic telephone
  induction coil
  limitations of magneto transmitter
  loose contact principle
  magneto telephone
  measurements of telephone currents
  variation of electrical pressure
  variation of resistance
Electrical signals
  audible
    magneto-bell
    telegraph sounder
    telephone receiver
    vibrating bell
  visible
    electric lamp signal
    electromagnetic signal
Electrodes
  arrangement of
  carbon preparation
  multiple
  single
Electrolysis
Electromagnetic method of measuring telephone currents
Electromagnetic signal
Electromagnets and inductive coils
  conventional symbols
  differential electromagnet
  direction of armature motion
  direction of lines of force
  electromagnets
  low-resistance circuits
    horseshoe form
    iron-clad form
    special horseshoe form