In his theology of nature he describes a schematic wing as consisting of a rigid ribbing in front, and a flexible sail behind.
Carried by the ribbing (the anterior margin of the wing) which lowers itself, the sail or posterior margin of the wing being raised meanwhile by the air, which sets it straight again, the sail will take an intermediate position and incline itself about 45° plus or minus according to circumstances.
Ribbing (1816-1899), C. Y.
Of these, Nyblaeus compiled a lucid account of Swedish philosophy from the beginning of the 18th century up to and including Bostrom; Ribbing (Platos Ideelara and Socratische Studien) showed how closely Swedish idealism is allied to Greek.
Copper daggers with parallel ribbing (61) down the middle are common in the XIth-XIVth Dynasties; and in the XVIIIth-XXth Dynasties they are often shown in scenes and on figures.