| PAGE | ||
| [Plate I.] | Comparative Altitudes | [22] |
| [Plate II.] | Optical Phenomena showing the Height of the Atmosphere | [26] |
| [Plate III.] | Temperature at different Latitudes and Altitudes | [31] |
| [Fig. 1.] | Nephoscope at Blue Hill Observatory. | [52] |
| [Fig. 2.] | Cloud Theodolite at Blue Hill Observatory | [54] |
| [Plate IV.] | Heights and Velocities of Clouds | [57] |
| [Plate V.] | Atmospheric Circulation at different Heights in Cyclones and Anti-cyclones | [61] |
| [Fig. 3.] | German Balloon equipped for Meteorological Observations | [87] |
| [Plate VI.] | Temperatures observed in Four High Balloon Ascents | [91] |
| [Fig. 4.] | German Kite-balloon. | [95] |
| [Fig. 5.] | Baro-thermograph of Richard | [102] |
| [Fig. 6.] | The Aérophile rising | [103] |
| [Plate VII.] | Heights and Temperatures recorded in eight Ascents of the Cirrus | [109] |
| [Fig. 7.] | Oriental tailless Kites. | [119] |
| [Fig. 8.] | Eddy tailless Kite | [129] |
| [Fig. 9.] | Hargrave Kite | [130] |
| [Fig. 10.] | Modified Hargrave Kites at Blue Hill | [133] |
| [Fig. 11.] | Lamson's Aero-curve Kite | [135] |
| [Fig. 12.] | Meteorograph lifted by Kites at Blue Hill | [138] |
| [Plate VIII.] | Meteorogram from the Kite-flight of Oct. 8, 1896, at Blue Hill | [148] |
| [Plate IX.] | Mean Changes with Height, and Changes during the Kite-flight of Oct. 8, 1896 | [150] |
| [Plate X.] | Changes with Height recorded by Kites at Blue Hill | [155] |
| [Plate XI.] | Kite Observations at Blue Hill, Sept. 5-11, 1897 | [163] |
| [Plate XII.] | Automatic Records during a High Kite-flight at Blue Hill | [166] |
| [Plate XIII.] | Results of Kite-flights at Blue Hill during an Anti-cyclone and a Cyclone | [168] |
SOUNDING
THE OCEAN OF AIR
CHAPTER I
THE ATMOSPHERE—ANCIENT AND MODERN KNOWLEDGE—METHODS OF INVESTIGATION