Which 29.6 is the Height in Feet and Tenths corresponding to .0318 Tenths above Inches 28.1 Tenth: and Inches 28.1 Tenth gave Feet 3386.6 Tenths in Height: therefore an additional Height of so many Tenths or Decimals of an Inch of Quicksilver in the Tube of the Barometer, must give in Feet, a less Height of the lower Barometer, elevated above the imaginary Level indicated by the Quicksilver resting in the Tube at 32 Inches.[130]
402. Therefore subtract the Height, in Feet, corresponding to the Expansion on .0318 Tenths of an Inch (less than Inches 28.2 Tenths of the lower barometric Tube,) from the Height, in Feet, corresponding to the Expansion on 28.1 Tenth of the same Barometer, viz.
| 3386.6 | |
| 29.6 | |
| ——— | |
| and the Remainder - | 3357.0, |
gives the real Height in Feet of the lower Barometer, at 28.1318 when above the imaginary Level, and with the Temperature of freezing by the second Table.
403. Then, by taking the Number of Feet and Tenths above the imaginary Level, (indicated by the Quicksilver, in both Tubes, resting at 32 Inches) answering to the Expansion on Inches and Tenths of the lower Tube, from the Number of Feet, &c. by the former Process, answering to that of the upper Tube; viz.
| upper | 7292.1 |
| lower | 3357.0 |
| ——— | |
| and the remaining Feet | 3935.1 |
Tenth is the Height, by which the Station of the upper Barometer exceeds the Station of the lower; both being at the Temperature of 31°.24 on Farenheit’s Scale. See [Section 371].
END OF THE SECOND STAGE
11th Step.