Jacks [30]
K
Kellogg mechanical signal [28]
Kellogg trunk circuits [125]
Kellogg two-wire multiple board [84]
Keyboard wiring [67]
L
Lamp mounting [25]
Lamps [24]
Line signals [14]
direct-line lamp [14]
direct-line lamp with ballast [15]
line lamp with relay [17]
pilot signals [17]
Line switch [163]
Long-distance switching [293]
definitions [293]
center-checking [297]
operators' orders [294]
by call circuits [294]
by telegraph [294]
particular party calls [295]
switching through local board [293]
ticket passing [296]
trunking [295]
high-voltage toll trunks [295]
through ringing [295]
two-number calls [294]
use of repeating coil [293]
waystations [297]
Lorimer automatic system [144], [205]
central-office apparatus [208]
connective division [210]
sectional apparatus [209]
switches [213]
interconnector [214]
interconnector selector [214]
primary connector [213]
rotary switch [213]
secondary connector [214]
signal transmitter controller [214]
operation [215]
subscriber's station equipment [206]
M
Magneto multiple switchboard [53]
branch-terminal multiple board [58]
arrangement of apparatus [61]
magnet windings [61]
operation [60]
field of utility [53]
modern magneto multiple board [63]
assembly [66]
cord circuit [64]
test [62]
Magneto multiple switchboard
series-multiple board [54]
defects [57]
operation [56]
Measured service [310]
local service [316]
meter method [316]
prepayment method [318]
ticket method [316]
rates [310]
toll service [311]
long haul [311]
short haul [311]
timing toll connections [312]
units of charging [311]
Mechanical signals [27]
Kellogg [28]
Monarch [28]
Western Electric [27]
Mercury-arc rectifier circuits [237]
Monarch visual signal [28]
Multi-office exchanges, necessity for [109]
Multiple switchboard [43]
busy test [48]
cord circuits [46]
diagram showing principle of [47]
double connections [46]
field of each operator [51]
field of utility [43]
influence of traffic [52]
line signals [45]
multiple feature [43]
P
Phantom circuit [321]
Pilot signals [17]
Plug-seat switch [38]
Pole changers for harmonic ringing [231]
Power plants [227]
auxiliary signaling currents [233]
currents employed [227]
alternating current [227]
direct current [227]
operator's transmitter supply [228]
power plant circuit [248]
power switchboard [246]
meters [246]
protective devices [248]
switches [246]
primary sources [234]
charging from direct-current mains [234]
charging dynamos [235]
mercury-arc rectifiers [236]
rotary converters [234]
provision against breakdown [237]
capacity of power units [238]
duplicate charging machines [238]
duplicate primary sources [238]
duplicate ringing machines [238]
ringing-current supply [229]
magneto generators [229]
pole changers [229]
ringing dynamos [232]
storage battery [239]
initial charge [241]
installation [240]
low cells [244]
operation [242]
overcharge [243]
pilot cell [243]
regular charge [244]
replacing batteries [245]
sediment [245]
types [227]
common-battery systems [228]
magneto systems [228]
Power switchboard [246]
Private-branch exchanges [271]
with automatic offices [278]
secrecy [279]
battery supply [279]
circuits, key-type board [276]
definitions [271]
desirable features [281]
functions of the private-branch exchange operator [272]
marking of apparatus [281]
private-branch switchboards [273]
common-battery type [273]
cord type [275]
key type [275]
magneto type [273]
ringing current [280]
supervision of private-branch connections [277]
R