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The principle has already been explained namely, the alternate rising and falling of an iron rod within a helix through which an electro-magnetic current is made to pass: when the current is on, the rod rises, and remains, as it were, self-suspended, equidistant from all parts of the surrounding helix; and falls as soon as the current ceases by breaking contact with the battery.
The sun had set, but we saw its reflection beautifully on one side of the balloon, so that it looked like a globe half ice, half fire, or half moon, half sun, self-suspended in the air. It went up exactly a mile. I say exactly, because Pictet measured the height by an instrument of a new invention, which I will describe when we meet.
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