(under subclass 34) Systems in which the home indication is actuated or controlled by the presence or absence of current and the distant indication by the change of some characteristic of the track-circuit current.
(1) Note. As line-wire distant control is dispensed with, the system is sometimes referred to in the art as "wireless", but should not be confused with the true or Hertzian-wave
"wireless" of subclass 30.
SEE OR SEARCH THIS CLASS, SUBCLASS:
26, 34+, 41+, 58+, 95, 98, 128+, and 130, for track-circuit systems.
35, 44, 45, and 60, for means for the actuation of the signals.
52, 224 and 481, for home and distant type. 53, and 223, for three-position type of semaphore.
SEE OR SEARCH CLASS
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,
230+, for polarized electromagnets and subclasses 266+ for differential electromagnets.
340, Communications: Electrical,
825+, for selective signaling systems of general application.
