| 121 | 12 | 24 | 36 | 48 | 60 | 73 | 85 | 97 | 109 | | 122 | 12 | 24 | 37 | 49 | 61 | 73 | 85 | 98 | 110 | | 123 | 12 | 25 | 37 | 49 | 61 | 74 | 86 | 98 | 111 | | 124 | 12 | 25 | 37 | 50 | 62 | 74 | 87 | 99 | 112 | | 125 | 12 | 25 | 37 | 50 | 62 | 75 | 87 | 100 | 112 | | 126 | 13 | 25 | 38 | 50 | 63 | 76 | 88 | 101 | 113 | | 127 | 13 | 25 | 38 | 51 | 63 | 76 | 89 | 102 | 114 | | 128 | 13 | 26 | 38 | 51 | 64 | 77 | 90 | 102 | 113 | | 129 | 13 | 26 | 39 | 52 | 64 | 77 | 90 | 103 | 116 | | 130 | 13 | 26 | 39 | 52 | 65 | 78 | 91 | 104 | 117 | +-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+ END OF THE SECOND STAGE. 374. The Ends proposed in the third and last Stage of the Work, are, first, to add the _general_ Temperatures of the Air, or detached Air-Thermometers, at each Place of Observation _above_ and _below_, into one Sum. Secondly, to divide that Sum: each Moiety of which is called the _mean Temperature_ of the Air. Thirdly, to apply that Moiety to each Barometer, (both of which have been already brought to the Standard-Temperature of 31°. 24;) in order to prove whether the Moiety (or Quantity of Heat assigned to each Barometer by the _general_ Temperature of the Air) _exceeded_, _fell short of_, or equalled the Standard-Temperature of the Barometers, by the 2d Table. And fourthly, from the Moiety or mean Temperature of the Air, to find the true Height of the upper Barometer: which Temperature resolves itself into three Cases. 375. 1st. If the Moiety or mean Temperature of the Air is greater than the Standard Temperature, viz. that to which the Barometers are now brought; find the Expansion of Air corresponding to such _Excess_ of Temperature by the fourth Table, which Height by Expansion, being added to the Height already found in the 2d Table, shews the true Height, viz. of the upper Barometer. N. B. The 3d and last Stage includes two Steps only, viz, 11th and 12th. 376. 11th Step. The detached Air-Thermometer _above_ was — — 39½ Degrees. The detached Air-Thermometer _below_ was — — 45 1st. Add them, for the whole Heat. — — — 2)84½ Degrees. 2d. For _mean Temperature_ of the Air-Thermometers, or a _Moiety_ of the Heat, divide by 2. — 42¼ 3d. Deduct the Standard-Temperature of — — — 31¼ from either Moiety, and the Remainder ——— — — — 11 is the 11 Degrees of Heat, more than the Standard[123] for each Barometer. For 42°¼, and 42°¼, equal to 84°½, was the whole Height of the Air at both Places of Observation in the upper and lower Stations; of which whole Height the detached or Air-Thermometer _above_ received 39°½, and the detached or Air-Thermometer _below_, received 45°.