NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: telegraphic longitude article
From: Jan Kalivoda
Date: 2003 Dec 27, 12:44 +0100
From: Jan Kalivoda
Date: 2003 Dec 27, 12:44 +0100
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