367. The Ends proposed in the second Stage of the Work, (the colder Barometer being now brought to the same Expansion or Temperature with the warmer,) are two: First, to find, (by the Application of the second Table) the Heights, in Feet and Tenths, in the Atmosphere, corresponding to the Points at which the Quicksilver stands in both Barometers, which have now the same Temperature, viz. that of the warmer equal to 50°: on a Supposition that they were both exposed to the Temperature of 31°.24, on Farenheit’s Scale, which is about the Standard or freezing Point, for which sole Purpose the 2d Table is calculated.
N. B. The Second Stage includes two Steps only, viz. the 7th and 8th.
368. 7th Step. The Barometers being placed in one View, as before directed, thus:
Upper Barometer, Inches 25 .2 Tenths.
Lower Barometer, Inches 29 .4; find, with the Temperature of 31°.24, the corresponding Heights in the Atmosphere.
This is to be done by referring to the 2d Table, for the Application of which there are separate Instructions: See the Explanation of the second Table.[120]