Statistics for occurrence #1 of “Professor Sears C. Walker” in chapter 3 of George Meade, The Life and Letters of George Gordon Meade, Major-General United States Army:

...opted for the survey consisted in a modification of the then existing method for the determination of longitudes by the electric telegraph, known as the American method. This method was invented by Professor Sears C. Walker . Professor Alexander D. Bache, superintendent of the Coast Survey, says in his report for 1853: He (Professor Walker) invented the application of the galvanic circuit to the recording of astronomical...
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