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George Meade, The Life and Letters of George Gordon Meade, Major-General United States Army (ed. George Gordon Meade), chapter 3 (search)
the transit of a star over both meridians was recorded at each station by the time as shown by the eastern clock only, and the difference of the times of transit gave the difference of longitude by the eastern clock. To obtain, therefore, a final result (the mean of the two) had to be observed at each station. Captain Meade proceeds to say, in an explanation which is mainly too technical to be introduced here, that, in discussions with Professor C. A. Young, of Western Reserve College, Hudson, Ohio, he had suggested the convenience of an arrangement, afterward carried out through Professor Young's special skill in electric telegraphy, by which the transit of a star over each meridian was recorded on both eastern and western clocks. The only objection made to this innovation was that the resulting determination of the difference of longitude between stations would be affected by any variation that might take place in the pass of the relay-magnet during the passage of the stars betwe