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10 The Nevada Traverse Vol.51, No.3, 2024He observed, %u201cHow to use the barometer to the best advantage over so extended a line of survey, was a problem which each officer in charge of a party had to decide for himself.%u201d To that end he added, %u201cAs the aim of my observations and investigations is to afford information of practical value to that class of persons who use the barometer as a surveying instrument, I have thought it advisable to devote some little space to explaining the proper manner of observing, and of making the necessary reductions.%u201d The work, four-hundred and three pages long, is exhaustive. It includes charts, graphs and explanatory text. It went to the printer in 1868 and remains in print to this day.End Part IRobert Stockton Williamson... continued from previous pageR. S. Williamson%u2019s Map 2, %u201cFrom the Northern Boundary of California to the Columbia River%u201d, 1855