M
Magnetic flux [144]
Magnetization curves [145]
Magnetizing force [143]
Magneto bell [40], [115]
Magneto operator [116]
Magneto signaling apparatus [115]
armature [119]
automatic shunt [124]
battery bell [115]
generator symbols [127]
magneto bell [115]
magneto generator [116]
method of signaling [115]
polarized ringer [128]
pulsating current [126]
ringer symbols [131]
theory [117]
Magneto switchboard [324]
automatic restoration [341]
mechanical [341]
Dean type [344]
Kellogg type [342]
Monarch type [345]
Western Electric type [313]
circuits of complete switchboard [356]
code signaling [346]
commercial types of drops and jacks [335]
early drops [335]
jack mounting [338]
manual vs. automatic restoration [340]
methods of associating [339]
night alarm [338]
tubular drops [336]
component parts [325]
jacks and plugs [325]
keys [327]
line and cord equipments [328]
line signal [325]
operators' equipment [328]
cord-circuit considerations [364]
double clearing-out type [368]
lamp-signal type [371]
non-ring through type [366]
series drop type [366]
simple bridging drop type [364]
definitions [324]
electrical restoration [347]
grounded and metallic-circuit lines [360]
mode of operation [324]
night-alarm circuits [358]
operation in detail [328]
clearing out [335]
essentials of operation [335]
normal condition of line [329]
operator answering [330]
operator calling [332]
subscriber calling [330]
subscribers conversing [333]
operator's telephone equipment [354]
cut-in jack [355]
ringing and listening keys [351]
horizontal spring type [351]
party-line ringing keys [353]
self-indicating keys [354]
vertical spring type [352]
switchboard assembly [373]
functions of cabinet [373]
sectional switchboards [384]
upright type of switchboard [376]
wall type switchboard [373]
switchboard cords [349]
concentric conductors [350]
parallel tinsel conductors [351]
steel spiral conductors [350]
switchboard plugs [348]
Magneto telephone [26]
Magneto telephone sets [209]
Mica card resistance [174]
Mica slip fuse [302]
Microtelephone set [223]
Monarch drop and jack [345]
Monarch receiver [86]
Monarch transmitter [73]
Multiple electrode [65]
Mutual induction [54]
N
Non-inductive resistance devices [172]
inductive neutrality [174]
provisions against heating [174]
temperature coefficient [172]
types
differentially-wound unit [175]
iron wire ballast [177]
lamp filament [176]
mica card unit [174]
Non-selective party-line systems [227]
bridging [230]
limitations [235]
series [229]
signal code [233]
O
Open-circuit cells [99]
Open-circuit impedance coil [164]
Operator's receiver [90]
P
Packing of transmitters [75]
Permeability [144]
Pitch [20]
Doppler's principle [20]
vibration of diaphragms [21]
Polarity method of selective signaling [239]
Polarization of cells [96]
Polarized ringer [41], [128]
brazed bell [130]
Kellogg [129]
Western Electric [128]
Poole lock-out system [264]
Primary cells [92]
conventional symbol [114]
series and multiple connections [98]
simple voltaic [92]
types of
closed-circuit [106]
Fuller [109]
gravity [106]
Lalande [112]
prevention of creeping [106]
setting up [108]
open-circuit [99]
Le Clanché [99]
standard [113]
chloride of silver [113]
Propagation of sound [19]
Protective means [294]
against high potentials [294]
air-gap arrester [295]
advantages of carbon [296]
commercial types [297]
continuous arcs [300]
discharge across gaps [295]
dust between carbons [296]
introduction of impedance [299]
metallic electrodes [300]
vacuum arresters [299]
against sneak currents [304]
heat coil [306]
sneak-current arresters [305]
against strong currents [301]
fuses [301]
enclosed [302]
mica [301]
proper functions [301]
central-office protectors [310]
self-soldering heat coils [310]
sneak-current and air-gap arrester [310]
city exchange requirements [314]
complete line protection [306]
electrolysis [315]
subscribers' station protectors [312]
ribbon fuses [313]
Pulsating-current commutator [127]
R
Receivers [80]
Dean [88]
direct-current [84]
early [80]
Kellogg [83]
modern [81]
Monarch [86]
operator's [90]
single-pole [81]
symbols [91]
Western Electric [82]
Reluctance [147]
Repeating coil [168]
Ribbon fuses [313]
Ringer symbols [131]
Ringing and listening key [327]
Robert's latching relay [276]
Robert's self-cleansing arrester [297]
Rolled condenser [182]