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2. Plug and feather - Wikipedia

   en.wikipedia.org/wiki/Plug_and_feather

   The working principle of the plug and feathers. Each set consists of a metal wedge (the plug), and two metal shims (the feathers). The feathers are wide at the bottom, and tapered and curved at the top. When the two feathers are placed on either side of the plug, the combined width of the set is the same at both ends.

3. Feather development - Wikipedia

   en.wikipedia.org/wiki/Feather_development

   The tail feathers are used to control flight acting as rudder and brake, only some of these feathers are as firmly attached as the bird's primaries. Contour feathers are arranged on the body of the bird in the manner of roof tiles. The tips of these feathers are waterproof and help protect the bird from the elements, while the inner parts of ...

4. Wedge - Wikipedia

   en.wikipedia.org/wiki/Wedge

   Wedges can also be used to hold objects in place, such as engine parts (poppet valves), bicycle parts (stems and eccentric bottom brackets), and doors. A wedge-type door stop (door wedge) functions largely because of the friction generated between the bottom of the door and the wedge, and the wedge and the floor (or other surface).

5. Feather duster - Wikipedia

   en.wikipedia.org/wiki/Feather_duster

   A feather duster is a cleaning tool that is typically made from a wooden dowel handle onto which feathers are wound with a wire. The feathers are most often 14 to 32 inches (36 to 81 cm) long. The feathers are most often 14 to 32 inches (36 to 81 cm) long.

6. Carpet beater - Wikipedia

   en.wikipedia.org/wiki/Carpet_beater

   A carpet beater "Household gymnastics". A carpet beater or carpetbeater (also referred to as a rug beater or rugbeater, carpet whip, rug whip, clothes-beater, dust beater or dustbeater, carpet duster, wicker slapper, rug duster, or pillow fluffer, and formerly also as a carpet cleaner or rug cleaner) is a housecleaning tool used to beat carpets in order to shake dust and dirt out of them. [1]

7. Covert feather - Wikipedia

   en.wikipedia.org/wiki/Covert_feather

   A covert feather or tectrix on a bird is one of a set of feathers, called coverts (or tectrices), which cover other feathers. The coverts help to smooth airflow over the wings and tail. The coverts help to smooth airflow over the wings and tail.