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preface to fifteenth edition

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2.80 SECTION 2<br />

TABLE 2.12 Reduction of the Barometer <strong>to</strong> Sea Level—Metric Units (Continued)<br />

B. Values in millimeters <strong>to</strong> be added.*<br />

Temp.<br />

—Alt.<br />

Fac<strong>to</strong>r<br />

Barometer Reading in Millimeters<br />

790 770 750 730 710 690 670<br />

1 0.9 0.9 0.9 0.8 0.8 0.8<br />

5 4.6 4.4 4.3 4.2 4.1 4.0<br />

10 9.1 8.9 8.7 8.5 8.2 8.0<br />

15 13.8 13.4 13.1 12.7 12.4 12.0<br />

20 18.4 17.9 17.5 17.0 16.5 16.1<br />

25 22.5 21.9 21.3 20.7 20.1<br />

30 27.1 26.4 25.7 25.0 24.2<br />

35 31.7 30.8 30.0 29.2 28.4<br />

40 36.3 35.3 34.4 33.5 32.5 31.6<br />

45 39.9 38.8 37.8 36.7 35.6<br />

750 730 710 690 670 650 630<br />

50 44.4 43.3 42.1 40.9 39.7<br />

55 49.0 47.7 46.4 45.1 43.8<br />

60 53.6 52.2 50.8 49.3 47.9<br />

65 58.3 56.7 55.2 53.6 52.1<br />

70 61.3 59.6 57.9 56.2<br />

75 65.8 64.0 62.2 60.4<br />

80 70.4 68.5 66.6 64.6 62.7 60.8<br />

85 75.0 73.0 70.9 68.9 66.8 64.8<br />

90 77.5 75.3 73.1 71.0 68.8<br />

95 82.1 79.7 77.4 75.1 72.8<br />

710 690 670 650 630 610<br />

100 86.6 84.2 81.8 79.3 76.9<br />

105 91.2 88.7 86.1 83.5 81.0<br />

110 95.9 93.2 90.5 87.8 85.1<br />

115 100.5 97.7 94.8 92.0 89.2<br />

120 102.2 99.3 96.3 93.3<br />

125 106.8 103.7 100.6 97.5 94.4<br />

130 111.4 108.2 104.9 101.7 98.5<br />

135 116.0 112.7 109.3 105.9 102.6<br />

140 120.7 117.2 113.7 110.2 106.7<br />

145 121.7 118.1 114.5 110.8<br />

670 650 630 610 590 570<br />

150 126.3 122.5 118.8 115.0<br />

155 130.9 127.0 123.1 119.2<br />

160 135.5 131.5 127.4 123.4<br />

165 140.2 136.0 131.8 127.6<br />

170 140.5 136.2 131.9 127.5 123.2<br />

175 145.1 140.6 136.2 131.7 127.2<br />

180 149.7 145.1 140.5 135.9 131.3<br />

185 154.3 149.5 144.8 140.0 135.3<br />

190 158.9 154.0 149.2 144.3 139.4<br />

195 158.6 153.5 148.5 143.5<br />

* From Smithsonian Meteorological Tables, 3d ed., 1907.

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