broken-line method
operation
Poole system
step-by-step system
Loudness of sound
Low-reluctance circuits
horseshoe form
iron-clad form

M

Magnetic flux
Magnetization curves
Magnetizing force
Magneto bell
Magneto operator
Magneto signaling apparatus
armature
automatic shunt
battery bell
generator symbols
magneto bell
magneto generator
method of signaling
polarized ringer
pulsating current
ringer symbols
theory
Magneto switchboard
automatic restoration
mechanical
Dean type
Kellogg type
Monarch type
Western Electric type
circuits of complete switchboard
code signaling
commercial types of drops and jacks
early drops
jack mounting
manual vs. automatic restoration
methods of associating
night alarm
tubular drops
component parts
jacks and plugs
keys
line and cord equipments
line signal
operators' equipment
cord-circuit considerations
double clearing-out type
lamp-signal type
non-ring through type
series drop type
simple bridging drop type
definitions
electrical restoration
grounded and metallic-circuit lines
mode of operation
night-alarm circuits
operation in detail
clearing out
essentials of operation
normal condition of line
operator answering
operator calling
subscriber calling
subscribers conversing
operator's telephone equipment
cut-in jack
ringing and listening keys
horizontal spring type
party-line ringing keys
self-indicating keys
vertical spring type
switchboard assembly
functions of cabinet
sectional switchboards
upright type of switchboard
wall type switchboard
switchboard cords
concentric conductors
parallel tinsel conductors
steel spiral conductors
switchboard plugs
Magneto telephone
Magneto telephone sets
Mica card resistance
Mica slip fuse
Microtelephone set
Monarch drop and jack
Monarch receiver
Monarch transmitter
Multiple electrode
Mutual induction

N

Non-inductive resistance devices
inductive neutrality
provisions against heating
temperature coefficient
types
differentially-wound unit
iron wire ballast
lamp filament
mica card unit
Non-selective party-line systems
bridging
limitations
series
signal code

O

Open-circuit cells
Open-circuit impedance coil
Opera