Circuits [321]
applications [322]
composite [326]
phantom [321]
transmission over [324]
transpositions [323]
railway composite [327]
ringing [327]
simplex [324]
Common-battery multiple switchboard [69]
assembly [106]
Dean multiple board [93]
cord circuit [94]
line circuit [93]
listening key [94]
ringing keys [94]
test [94]
Kellogg two-wire multiple board [84]
battery feed [88]
busy test [90]
complete cord and line circuit [88]
cord circuit [86]
line circuit [85]
summary of operation [91]
supervisory signals [87]
wiring of line circuit [92]
multiple switchboard apparatus [97]
jacks [99]
lamp jacks [100]
relays [101]
Stromberg-Carlson multiple board [96]
cord circuit [96]
supervisory signals [97]
test [97]
Western Electric No. 1 relay board [69]
capacity range [80]
cord circuit [71]
functions of distributing frames [77]
line circuit [69]
modified relay windings [79]
operation [72]
operator's circuit detail [75]
order-wire circuits [78]
pilot signals [79]
relay mounting [80]
testing—called line busy [75]
testing—called line idle [74]
wiring of line circuit [76]
Western Electric No. 10 board [80]
circuits [81]
economy [84]
operation [83]
test [83]
Common-battery switchboard [11]
advantages of operation [11]
common battery vs. magneto [12]
cord circuit [20]
battery supply [20]
complete circuit [21]
supervisory signals [21]
cycle of operations [23]
jacks [30]
lamps [24]
mounting [25]
line signals [14]
direct-line lamp [14]
direct-line lamp with ballast [15]
line lamp with relay [17]
pilot signals [17]
mechanical signals [27]
Kellogg [28]
Monarch [28]
Western Electric [27]
relays [28]
switchboard assembly [31]
Composite circuits [326]
Connector [185]
Cord circuit [20]
Cord circuit
battery supply [20]
complete circuit [21]
supervisory signals [21]
Cord-rack connectors [66]
Cummings-Wray selector [342]
D
Dean multiple board [93]
Dispatchers' keys [339]
Dispatching on electric railways [356]
G
Gill selector [341]
H
Housing central-office equipment [249]
arrangement of apparatus in small manual offices [252]
combined main and intermediate frames [253]
floor plans for [252]
types of line circuits [255]
automatic offices [267]
typical automatic office [270]
central-office building [249]
fire hazard [249]
provision for cable runways [251]
provision for employes [251]
size of building [250]
strength of building [250]
large manual office [256]
I
Intercommunicating systems [282]
common-battery systems [283]
Kellogg plug type [284]
Kellogg push-button type [285]
Monarch system [287]
Western Electric system [285]
definition [282]
limitations [282]
for private-branch exchanges [290]
simple magneto system [282]
J