Later, as they began making cloth balloons, they observed that by launching progressively larger balloons, they were able to achieve higher altitudes and they could lift additional payload.
Hiljem riidest õhupalle valmistades märkasid nad, et mida suuremaid õhupalle nad lennutavad, seda kõrgemale need tõusevad ning seda suuremat raskust suudavad need kanda.