III. Observation concerning the height of the barometer, at different elevations above the surface of the Earth, in a letter to the publisher from the learned Dr. Nettleton

Abstract

Sir, Being curious to learn by Observation, how far the Mercury will descend int the Tube at any given Elevation, for which there is sufficient Opportunity hereabouts, I proposed to take the Altitude of some of our highest Hills; but, when we attempted it, we found our Observations so disturbed by Refractions, that we cou'd come to no Certainty.