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Excerpt from On the Use of the Barometer on Surveys and Reconnaissances: Being a Compendium, Without Plates, of No. 15 of the Professional Papers of the Corps of EngineersI may remark, in the first place, that whenever the read ings of the barometer are referred to in the following pages, those of the barometer reduced to 320 Fahrenheit are meant. In the barometric formula