- - at _first rapid_, with a rushing Noise, 96, 97 - - Proof of _gentle_, 100 - - Change in _visible_ Objects, during the, 182 - - of Balloons over Water, _enquired_ into, 229, 230 - - - - - - Means to prevent, 294, 295 Description of the Ascent, 47 Diameter of the Prospects _above_ and _below_, 52, 79 Diminution of Objects, _excessive_, when seen from the Balloon, 223 - - - - Laws respecting the, 224 Direction of the Balloon, Hints for the. 315 Distance seen from the Balloon, Calculations of the. 52, _a_. - - of the Balloon from _Chester_, at the Report of the 4th Cannon, 64 - - Idea of, from _Experience_, 158 - - what is the _greatest_, to be seen from the Summits of the _highest_ Mountains, 171, _a_. - - at which an Object can be distinguished by a _good_ Eye, 175, _a_. - - of the Balloon-_Course_, 191 - - at which, the Balloon was seen, 227 - - and Height of a Balloon, found by a Quadrant, 310 Dove turned out of the Car, 61 E. Earth removed from _Sight_, 170 Echo none _above_, 39 Eknèfiai Winds, what, 241 - - a dry Wind, 267 Electricity of the Air, 65 Elliptic Solid, the Form of the Balloon an, 160 Employments of the Aironaut, 32 Engines _Steam_, Models of, for Inflation, described, 429 Equatorial Hoop, its Use, 161, 315 Evaporation of _Steam_, 249 Expansion of the Balloon, by what Manouvre, 132 Experiment to prove whether the _superior_ Atmosphere be _hazy_, tho’ the Sun continue _shining_, 47, _a_. Experiments necessary, in order to improve the Modes of _Direction_, 296 Examples in the Mensuration of _Heights_ with Barometers. See Table. Example 1st, Practice of the, 351 - - - Recapitulation of the, 385 - - 2d, Practice of the, 386 - - - Recapitulation of the, 409 - - 3d, Practice of the, 410 - - 4th, Practice of the, to determine _small_ Heights, 419 - - 5th, Practice of the, to determine the Height of the Balloon, 423 F. Fish _Dìodon-Globe_, a _Model_ for Balloons, 377 Flag _white_, hung out a Quarter of a Mile in Length, 4 - - hung out half a Mile, in all, 66 - thrown _down_ at a Mile high, 59 - Descent of the, 60 - _white_, its Effect on the Balloon, 70 - - Progress of the Balloon marked by the. 91 - - _impeding_ the Balloon, 103 - - the remaining one unfolded, 105 - - shewed a Change in the _Direction_ of the _Wind_, 105 Flights with the Balloon, for three Hours longer, 193 Flying-Coach, 149 Foot Roman, the _Measure_ of a, 49, _b_. Form of the Balloon at its _greatest_ Altitude, 14 - - - the _same_ at each Descent, 159 G. Gass not offensive during the _Voyage_, why, 34 - procured by Means of _Acid_, 338 Gass procured by Means of _Steam_, 429 Geography Balloon, _first_ suggested, 167 Globe-Fish, a _Model_ for Balloons, 377 Grapple or Anchor, 13 Gums Copal, Sandarac, Mastic, &c., 326 H.