Relays [28]
Rotary connector [202]
S
Selecting switches [175]
Selector [175]
Simplex circuits [324]
Storage battery [239]
Storage cell [240]
Stromberg-Carlson multiple board [96]
Strowger automatic system [143]
Subscribers' board [259]-[261]
Switchboard assembly [31]
T
Table
automanual system time data [225]
automatic systems, messages per trunk in [305]
calling rates [302]
long-distance groups, messages per trunk in [305]
manual system, messages per trunk in [304]
out-trunking, effect of, on operator's capacity [303]
subscribers' waiting time [226]
Telephone traffic [298]
importance of traffic study [300]
methods of traffic study [301]
observation of service [308]
quality of service [305]
accuracy and promptness [307]
answering time [306]
busy and don't answer calls [307]
courtesy and form [307]
disconnecting time [306]
enunciation [308]
team work [308]
rates of calling [300]
representative traffic data [302]
calling rates [302]
operators' loads [302]
toll traffic [304]
trunk efficiency [303]
trunking factor [303]
traffic variations [298]
busy hour ratio [299]
unit of traffic [298]
Telephone train dispatching [333]
advantages [335]
apparatus [338]
Cummings-Wray selector [342]
dispatcher's transmitter [343]
Gill selector [341]
portable train sets [345]
siding telephones [345]
waystation telephones [344]
Western Electric selector [338]
blocking sets [355]
causes of its introduction [334]
Cummings-Wray circuits [350]
on electric railways [356]
Gill circuits [349]
railroad conditions [337]
rapid growth [333]
test boards [353]
transmitting orders [337]
waystation circuits [348]
Western Electric circuits [347]
Telephone train-dispatching circuit
Cummings-Wray [350]
Gill [349]
waystation [348]
Western Electric [347]
Test boards [353]
Transfer switchboard [34]
field of usefulness [41]
handling transfers [38]
limitations [40]
plug-seat switch [38]
transfer lines [35]
jack-ended trunk [35]
plug-ended trunk [37]
Trunking in multi-office systems [109]
classification [112]
one-way trunks [103]
two-way trunks [112]
Kellogg trunk circuits [125]
necessity for exchanges [109]
Western Electric trunk circuits [116]
W
Warner pole changer [230]
Waystation telephones [344]
Western Electric
mechanical signal [27]
selector [338]
trunk circuits [116]
Transcriber's Notes.
Spelling variants where it wasn't possible to determine the author's intent were left as is. These include: "clockwork" and "clock-work;" "doorkeeper" and "door-keeper;" "interrelation" and "inter-relation;" "multicyclic" and "multi-cyclic;" "redesign" and "re-design," along with derivatives.