* * * * * 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] CHAPTER LXXIII. USE AND PRACTICE OF THE SECOND TABLE IN THE FIRST EXAMPLE. _The_ +use+. Section 369. To find 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_ Barometer, on a Supposition that they were both exposed to the Standard-Temperature of 31°.24, on Farenheit’s Scale. _The_ +practice+. _The 7th Step applied in the first Example._ 370. Look at the first Column, in the _second_ Table, for 25.2, and the Answer is 6225.0 in the second Column; and for 29.4, and the Answer is 2208.2. The Answers are the Heights, in Feet and Tenths, in the Atmosphere, at which the Quicksilver stands in both Barometers, with the Temperature of 31°.24: corresponding to their respective Points, for which _sole_ Purpose this Table is calculated. 371. 8th Step. Having placed the Barometers and their corresponding Heights in the Atmosphere, shewn by the second Table, at one View: subtract the lesser from the whole Height, and there will remain, +secondly+; (see Section 367) the greater Height, viz. the Height corresponding to the Barometer in the elevated Station, above the Height corresponding to the Barometer, on the Ground, (both being at the Temperature of 31°.24) thus: Feet. Inches 25.2 correspond to 6225.0 Inches 29.4 correspond to 2208.2; subtract: —————— and the Remainder is 4016.8 viz. a Number in Feet and Tenths corresponding to the Height of the upper above the lower Barometer, both being in the Temperature of 31°.34. (See Page 295.) THE SECOND TABLE.