impedance coils
    kind of iron
    number of turns
    types
      closed-circuit
      open-circuit
      toroidal
  induction coil
    current and voltage ratios
    design
    functions
    use and advantage
  magnet wire
    enamel
    silk and cotton insulation
    space utilization
    wire gauges
  magnetic flux
  magnetization curves
  magnetizing force
  mechanical details
  permeability
  reluctance
  repeating coil
  winding methods
    winding calculations
    winding data
    winding terminals
Electrostatic capacity
  unit of
Electrostatic telephone
Enamel

F

Five-bar generator
Fuller cell

G

Galvani
Generator armature
Generator cut-in switch
Generator shunt switch
Generator symbols
Granular carbon
Gravity cell

H

Hand receivers
Harmonic method of selective signaling
  advantages
  circuits
  in-tune system
  limitations
  principles
  tuning
  under-tune system
Head receivers
Heat coil
Holtzer-Cabot arrester
Hook switch
  automatic operation
  contact material
  design
  desk stand hooks
    Kellogg
    Western Electric
  purpose
  symbols
  wall telephone hooks
    Dean
    Kellogg
    Western Electric
Horseshoe electromagnet
Human ear
Human voice

I

Impedance coils
  kind of iron
  number of turns
  symbols of
  types
    closed-circuit
    open-circuit
    toroidal
Inductance vs. capacity
Induction coil
  current and voltage ratios
  design
  functions
  use and advantage
Inductive neutrality
Inductive reactance
Insulation of conductors
Introduction to telephony
Iron-clad electromagnet
Iron wire ballast

K

Kellogg
  air-gap arrester
  desk stand hook
  drop and jack
  receiver
  ringer
  transmitter
  wall telephone hook

L

Lalande cell
Lamp filament
Le Clanche cell
Lenz law
Line signals
Lines of force, direction of
Loading coils
Lock-out party-line systems
  broken-line method
  operation
  Poole system
  step-by-step system
Loudness of sound
Low-reluctance circuits
  horseshoe form
  iron-clad form

M