399. 8th Step. Subtract the latter from the former and the Remainder is 107.9, the same as in the 3d Column: viz. the Height, in Feet and Tenths, corresponding to one Tenth only, namely, the ist Tenth above Inches 24, .1 Tenth: with the Temperature of 31.24 of Farenheit, for which sole Purpose the 2d Table is calculated. A new Question _then_ arises, viz. what are the Heights in Feet and Tenths, corresponding to the remaining Tenths or Decimals of an Inch above Inches 24, .1 Tenth, viz. .08 .009 .0002? which is to be resolved, by Application of the 3d Table, or Table for _Tenths_, which see, (Section 373.) [Sidenote: _9th Step._] 400. _9th Step applied in the 2d. Example._ First for the _upper_ Barometer. Look in the Table for Tenths, in the left vertical Column with 107, (rejecting the .9, as too minute;) and along the horizontal Line at the top, with 8: and find the Answer _gradually_, thus: 1st. With 107, and 8, (as a whole Number,) answering to .08: which, in the Place of Meeting, gives 86 Feet. 2d. With 107, and 9, (as a whole Number,) answering to .009: which, in the Place of Meeting, gives 97. 3d. With 107, and 2, (as a whole Number,) answering to 0002: which, in the Place of Meeting, gives 21. Place them in View, and add, and bring them back again into Decimals, thus: With 107 and 8, answering to .08 giving 86. Feet and 9, to .009 9.7 and 2, to .0002 .21 ————— 95.9|1 (Next: with the 9, _if required_; which was before rejected:) but there being no .9 Tenths in the left Vertical, call it 90, and allow for it in each Answer by moving the decimal Point two Places to the left, thus: with 90, and 8, answering to .08 giving 72 = .72 and 9, to .009 81 = .081 and 2, to .0002 18 = .0018 ———— To .8|00|28 Add the former Sum 95.9| ————— Total = 96.7) Which 95.9 is the _Height_ in Feet and Tenths corresponding to .0892 Decimals of an Inch above Inches 24 .1 Tenth: and 24 .1 gave Feet 7388.0 in _Height_; therefore an additional _Height_, of so many Tenths of an Inch of Quicksilver in the Tube of the Barometer, must give in Feet, a _less_ Height of the Barometer elevated above the _imaginary_ Level indicated at 32 Inches. [Sidenote: _10th. Step._]