. Animal flight; a record of observation . Fig. 46. Diagram showing horizontal napping night at different , slow ; B, medium ; C, fast. The arrows show the directionof beat of the wings. Note that the slower the flight the more arethe wings advanced. The cause of this will be explained in ChapterXI. In each figure the wing section drawn as a continuous linerepresents the disposition during the down-stroke. The dottedline represents the disposition during the up-stroke. B may betaken to represent the ordinary flapping flight of the larger birds. Cis only seen in fast flight of small bir
. Animal flight; a record of observation . Fig. 46. Diagram showing horizontal napping night at different , slow ; B, medium ; C, fast. The arrows show the directionof beat of the wings. Note that the slower the flight the more arethe wings advanced. The cause of this will be explained in ChapterXI. In each figure the wing section drawn as a continuous linerepresents the disposition during the down-stroke. The dottedline represents the disposition during the up-stroke. B may betaken to represent the ordinary flapping flight of the larger birds. Cis only seen in fast flight of small birds. the wings suddenly and strongly in the dihedrally-upposition causes a sudden rotation and consequentlyacts as a brake. Another case in which the dihedrally-up position acts as a brake has been described in thechapter on the functions of the tail. Conversely, flapping with the wings retired mustcause rotation round the transverse axis in the oppositedirection. This in fact corresponds with my obser-vations. I have been able to see both
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