Prepare this Height for Addition to the Numbers already found.
practice of the 2d Part of Case the 2d.
395. To find the Expansion of .6 above 4° on .178 above 24 Inches.
The Expansion with 4° on .178 is already found to be .0000712: divide it by 4, and the Answer is .0000178, viz. the Expansion with 1° on .178 above 24 Inches:
And, for the Expansion with .1 Tenth; the Answer, with the Addition of a Cypher and decimal Point to the left, becomes .00000178.
Lastly, for the Expansion with .6, say,
If .1 : .00000178 :: .6?
Multiply the 2d and 3d Terms, and divide by first:
| .00000178 |
| .6 |
| ————— |
| .000001068. |
The Answer is a Decimal less, viz. .00001068; i. e. the Decimal of an Inch, to which .6 Tenths of a Degree above 4 Degrees of Heat, on .178 Tenths of an Inch above 24 Inches, raises the Barometer: which, after all, is so inconsiderable, that it may be fairly rejected.