. Animal flight; a record of observation . i54 ANIMAL Position of wing ofpoising kingfisherduring up - stroke. the area of the wing now forms an inclined plane, in-clined in the opposite direction. As in the formercase there is a resultant force tending to lift the bird. Because the bird remains in the same place thelift on the down-stroke must equal the lift on the up-stroke. If, owing to its shape, the areaof the wing is less efficient in lifting onthe up-stroke then this lack of efficiencymust be compensated by greater or not this is the case in thepied kingfisher it
. Animal flight; a record of observation . i54 ANIMAL Position of wing ofpoising kingfisherduring up - stroke. the area of the wing now forms an inclined plane, in-clined in the opposite direction. As in the formercase there is a resultant force tending to lift the bird. Because the bird remains in the same place thelift on the down-stroke must equal the lift on the up-stroke. If, owing to its shape, the areaof the wing is less efficient in lifting onthe up-stroke then this lack of efficiencymust be compensated by greater or not this is the case in thepied kingfisher it is not possible to seeowing to the extreme rapidity of thebeats when poising. But in the caseof some larger birds, and in thecase of the flying-fox, I have been abledefinitely to observe that the movement of the wingswhen in horizontal flight is faster on the up-stroke. In the poising pied kingfisher thestrokes are of much greater amplitudethan they are in ordinary horizontalflapping flight. At the end of thedown-stroke the wings nearly meet inthe front of t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectan, booksubjectflight
