Three classes of airships are recognized: the non-rigid, commonly called blimp, in which the form of the bag is kept up(p) by pressure of the natural gas; the semi-rigid airship, in which, to maintain the form, gas pressure acts in conjunction with a longitudinal spin around; and the rigid airship, or zeppelin, in which the form is determined by a rigid structure. Technically all three classes may be called dirigible (Latin dirigere, &q...If you want to get a luxuriant essay, order it on our website: Orderessay
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