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If I understood George Huxtable well, both places A and B worked with time 
pulses sent through the line only by the chronometer in A and marked their 
meridian passages against A-pulses (obtained by telegraph in B). The shift of 
the time of a meridian passage of the same star from A to B against A-pulses 
gave the longitude difference between A and B without any need of knowing the 
real signal delay in the wire.

After the accurate longitude difference of B to Greenwich (or any other place 
A) had been known, one could compare his chronometers in B with the time in A 
by meridian passages at B without blocking the telegraph line.

Thank you, George.


Jan Kalivoda

   

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