GLOSSARY.
science concerned with the flight of an aerodrome. Thus the present work may be entitled a Treatise on Aerodromics, and the whole subject of aerial flight would be dealt with at a College or University by a lecturer or professor of Aerodromics.
Apteroid (Author), from the Greek α, πτερόν and ειδος, the converse of pterygoid. Thus apteroid aspect, with the greater dimension arranged in the direction of flight; (the reverse to that which obtains in the wing plan-form of birds), §§ 150, 151.
Aspect (Dict.), proposed by Langley in its present usage to denote the arrangement of the plan-form of an aeroplane, or other aerofoil, in relation to the direction of flight, § 144.
Ichthyoid (Dict.), fish-shaped, here applied to denote a body of practical stream-line form, § 9.
Peripteral. See Periptery.
Peripteroid. See Periptery.
Periptery (Diet.), proposed by the author in its present usage as denoting the region round about the wing or in the vicinity of the aerofoil (Greek. περι and πτερόν), § 107. Hence peripteral, as in peripteral theory (Ch. 4), peripteral area, § 210; peripteral zone, § 210; peripteral motion, § 126 {see also footnote 2, p, viii.. Preface). Hence also peripteroid motion, §nb122 (Greek, περι, πτερόν and ειδος, the form of flow proper to the inviscid fluid in a doubly connected region, resulting from the superposition of a cyclic motion on one of translation. Resembling the motion in the pieriptery, lit. round-about-the-wing-like.
Pterygoid (Diet.), icing like. Hence pterygoid aspect, with the lesser dimension in the direction of flight, as in the wing plan-form of a bird, § 152.
Sweep (Diet.), proposed by the author in its present usage to denote the cross-sectional area of the stratum of fluid, supposed by hypothesis to be that to whose inertia the supporting reaction is due, § 160.
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