The feather/spring keel is the middle part (bar) of the feather/spring of a bird. The top of the keel is called shank of the feather/spring, the lower spindle.
In earlier times bird feathers/springs than recorder were used, the feather/spring keel were called. Since feathers/springs were usually used by geese, they also goose keel or (older) Gantenkiel are called. To the letter i.d.R. the outermost five feathers/springs of a wing were taken. If one liked to try today to write with a feather/spring one should make certain that left-handed people purchase the feathers/springs of the right wing and the feathers/springs of the left wing. The reason for it is the anatomical arrangement and the handiness of the keel resulting from it. To the letter the Befiederung of the keel was frequently removed, since one felt this as disturbing.
If one wants to cut a keel, then one must harden him first. In addition the keel is begun to cut diagonally and Marks are removed or back-pressed. Subsequently, one yields the keels in a glass water in until they appear completely white. One puts the eingeweichten keel now into a container with hot sand, which must be so hot that the keels hiss, but not to tear. One leaves it so long therein to it at its points transparency is. To the conclusion the skin with a sharp measurer, present at the keel, is down-scratched and wiped off. Subsequently, the cut can take place.
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