nitiated by the rotary switch is the starting of the
signal-transmitter controller of the connective division, which, in
turn, adjusts the register of the interconnector selector to a position
corresponding to the thousands digit of the number of the called line as
indicated by the signal transmitter at the calling station. This selects
an interconnector serving the lines of the selected thousand.

This initial selection being completed the rotary switch readjusts the
circuits of the connective division in such manner that in the further
progress of the signal-transmitter controller, its impulses will be
effective upon the register of the selected interconnector. In this
manner, the register of the interconnector, which may be upon the same
connective division as the rotary switch handling the call, or which may
be the interconnector of some other division, as determined by the
number of the called subscriber, is adjusted to a position corresponding
to the second or hundreds digit of the number called. The cylinder
switch of the interconnector then selects and appropriates an idle trunk
extending to a secondary connector upon some connective division serving
the hundred selected.

The rotary switch again shifts the circuits of the connective division
in such manner that the signal-transmitter controller is effective upon
the secondary connector, both register and cylinder, and adjusts the
register and cylinder, respectively, with their brushes in contact with
the tens and units digits, respectively, of the number of the called
line.

The conductors of the called line now are connected through the
secondary connector, the interconnector, and the interconnector selector
to the rotary switch; the conductors of the calling line are connected
through the primary connector to the rotary switch; thus completely
connecting the lines except at the rotary switch. To effect the
connecting together of the two lines, both rotary switch and
signal-transmitter controller must pass forward into their next
positions, the connection when thus effected being made through
conductors containing a repeating coil and main battery connection for
supplying talking current to the two lines and containing also ringing
and supervisory relays.

The called line is tested to determine if busy during the short interval
in which the rotary switch takes a short step to connect the calling and
the called lines. In this step of the rotary switch the b