Figure 44.—Feather fixation of fifth tier: a, tail feathers (1) are fixed by their quills (2) between the two divisions of composite bar (3) by a thread (4) which makes two diagonal turns around bar to clamp each quill and a single spiral turn around bar in interval between spaced feathers. b, three sets of clamp bars are made and so arranged that feathers in two back bars (2, 3) fill in spaces between feathers of front bar (1) and so form a close row of feathers directed upward; the three clamps are fastened at ends to vertical bundle (5) of leaflet midribs.