Fijnje van Salverda, Johannes Gerardus Wybo, 1822-1900, Waring, George E. (George Edwin), 1833-1898 · New York, D. Appleton & co. · leaf 109
AfiRIAL NAVIGATION. 96 under the wings of a rapidly soaring bird may suggest the thought that a loss of balance is possible. Against this danger the bird is able to provide in several ways; the tail, which acts as a rudder, may be turned vertically upward, the wings may be carried backward, or,… … Fig. 9. the neck may be stretched forward. The last is, for example, to be seen in the case of the heron, which in normal flight draws in its neck and holds its head be- tween its shoulders, but which when pursued by a bird of prey stretches out its neck and therewith increases its speed. The more…
Aeronautics
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