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When the balloon touches the ground, rolling of the car will be avoided by this flat surface, which will rest and drag on the ground. Internally, the upper margin of the side is fitted all round with about 100 cords terminating in buckles or eyes. To these cords, which are passed through the basket-work, instruments and various objects are to be attached. The roof of the car is a disc or cover, likewise of basket-work, slightly convex in order to prevent any accumulation of water. The margin of the periphery of this cover forms a cavity into which the margin of the car is inserted, thus preserving its peculiar shape. Cross-pieces of wood fixed inside the cover or roof impart to it the necessary rigidity to support the observers; entrance to the car and exit therefrom is effected by means of a trap-door which moves on hinges.

Above the flattened part, the cylindrical side of the car is fitted with two square windows with glass panes of 5¾ inches side; the bottom of the car has two square openings of 7⅘ inches side, closed by wooden trap-doors.