Repeat the same Process, viz. the 9th. and 10th. Steps, for the lower Barometer, thus:
For the lower Barometer in the 2d. Example.
First, Find the Height, in Feet, of the lower Barometer, standing at Inches 28.1318 Tenths, in the 2d. Column of the 2d. Table, corresponding to Inches and Tenths of the Quicksilver in the barometric Tube, in the first Column of the same Table, thus:
The lower Barometer standing at 28.1318; it must be considered, where in the 2d. Column of the 2d. Table, a Height corresponding to such Inches and Tenths can lye: and the Answer is, somewhere above 28 Inches, .1 Tenth, but not so high as 28 Inches .2 Tenths: 28.1318 Tenths being more than 28 Inches .1 Tenth, yet less than 28 Inches .2 Tenths.
| First, then, look, in the first Column for | 28.1, |
| and the corresponding Height, in Feet, is | 3386.6: |
| but the Height for 28.2, is only | 3294.0: |
| ——— | |
| subtracting the less from the greater; the Remainder is | 92.6, |
the same as in the 3d. Column, viz. the Height, in Feet and Tenths, corresponding to one Tenth only above 28.1.
Having therefore found that Feet 92.6 Tenths, are the Height, corresponding to one Tenth only above Inches 28.1 Tenth, of the lower Barometer, with the Temperature of freezing; for which sole Purpose, the 2d Table is calculated;—a new Question arises, viz. what are the Heights, in Feet and Tenths, corresponding to the remaining Decimals above 28.1, viz.
.03
.001
.0008; to be resolved by Application of the third Table, or Table for Tenths, which see, (in Section 373.)
Look in the 3d. Table, with 92, (omitting the .6 as too minute) and with
| 3 | answering to | .03, | which gives | 28 = | Feet | 28. |
| 1 | to | .001, | 9 = | .9 | ||
| 8 | to | .0008, | 74 = | .74 | ||
—— | ||||||
29.6|4 | ||||||