[GreenKeys] Teletype M14 - Marion, VA

[Jim Haynes]

What Duncan is talking about is a WW-II expedient to increase traffic
capacity.  A two-headed XD was made with the usual start and stop
distributor segments and the other five divided in two.  One read
head was connected the the early segments and the other to the late
segments.  For receiving you would adjust the range finder on a printer
so that it would sample in the early half of the pulse time or in the
late half.  Thus you have two-channel multiplex, assuming the circuit
was good enough to deliver sufficiently distortion-free signals
to the printers.