e road is also equipped with a message
circuit in addition to the train wire?

21. Why do some railroads have block wires in addition to train wires
and message circuits?

22. If a waystation on a block wire is to be cut out for any length of
time, by what method can the two adjacent blocks be connected,
eliminating the station between?

23. What are some of the methods used for dispatching on electric
railways where the traffic is not especially heavy?

24. On an electric road in case a car approaches a semaphore set at
"danger," what must the crew of the car do?

INDEX

_The page numbers of this volume will be found at the bottom of the
pages; the numbers at the top refer only to the section._

A

Automanual system 218
automatic distribution of calls 223
automatic switching equipment 222
building up a connection 224
characteristics of 218
operation 219
operator's equipment 220
setting up a connection 224
speed in handling calls 224
subscriber's apparatus 219

Automatic desk stand 158

Automatic Electric Company's telephone system 149
automatic sub-offices 201
connector 185
function of 185
location of 186
operation of 186
first selector operation 179
function of line switch 152
line switch 153, 163
bridge cut-off 173
circuit operations 167
guarding functions 173
line and trunk contacts 164
locking segment 172
master switch 171
relation of, to connectors 174
structure of 166
summary of operation 174
trunk ratio 165
trunk selection 165
multi-office system 196
party lines 202
release after conversation 196
rotary connector 202
second selector operation 182
selecting switches 153, 175
release mechanism 178
side switch 175
subdivision of subscribers' lines 152
subscribers' station apparatus 158
operation 160
bell and transmitter springs 160
ground springs 160
impulse springs 161
release springs 163
ringing springs 163
salient points 163
trunking 154
connector action 157
first selector action 156
line switch action 154
second selector action 156
two-wire automatic systems 203
two-wire and three-wire systems 157
underlying feature of trunking system 153

Automatic telephone systems 135
arguments against 135
attitude of public 141
complexity 136
expense 140
flexibility 140
subscri