It in fact ensures that the wing, and the curtain or fringe of the wing which the primary and secondary feathers form, shall be screwed into and down upon the wind in extension, and unscrewed or withdrawn from the wind during flexion.
The gates of the sanctuary screen were closed, the curtain was slowly drawn, and from behind it a soft mysterious voice pronounced some words.
Though she wasn't hungry, she drank, exploring the black curtain shielding his memories as she did.
Suddenly a gust of wind beat violently against the casement of the window, from which the double frame had been removed (by order of the prince, one window frame was removed in each room as soon as the larks returned), and, forcing open a loosely closed latch, set the damask curtain flapping and blew out the candle with its chill, snowy draft.
The curtain blocking him from his memories was less defined, like ice beginning to thaw.
An auroral curtain travelling with considerable velocity would approach from the south, pass right overhead and retire to the north.
When the curtain rises again we enter upon the historical traditions of the Old Testament.
As the curtain approached, the compass needle always deviated to the west, oscillated as the curtain passed the zenith, and then deviated to the east.
The curtain rose again.
The behaviour of the needle, as Paulsen points out, is exactly what it should be if the space occupied by the auroral curtain were traversed by electric currents directed upwards from the ground.