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A deicing boot is a type of ice protection system installed on aircraft surfaces to permit a mechanical deicing in flight. Such boots are generally installed on the leading edges of wings and control surfaces (e.g. horizontal and vertical stabilizer ) as these areas are most likely to accumulate ice which could severely affect the aircraft's ...
William C. Geer (1876 – 9 September 1964) was a B.F. Goodrich chemist and eventual Vice President of Research known for inventing the aircraft Deicing boot. [1] [2] Geer began working on the deicing problem in 1927. By 1929 the work showed enough promise that he won support from the Guggenheim fund, and by 1930 he had made the first flight ...
An Aeroflot Airbus A330 being de-iced at Sheremetyevo International Airport Econ Salt Spreader. De-icing is the process of removing snow, ice or frost from a surface. Anti-icing is the application of chemicals that not only de-ice but also remain on a surface and continue to delay the reformation of ice for a certain period of time, or prevent adhesion of ice to make mechanical removal easier.
Pneumatic boots are appropriate for low and medium speed aircraft, without leading edge lift devices such as slats, so this system is most commonly found on smaller turboprop aircraft such as the Saab 340 and Embraer EMB 120 Brasilia. Pneumatic de-icing boots are sometimes found on other types, especially older aircraft.
In knitting, picking up stitches means adding stitches to the knitting needle that were previously bound off or belong to the selvage. Picking up stitches is commonly done in knitting garments, e.g. in knitting the collar or sleeves, and is essential for entrelac knitting.
If the fabric is being knit back-and-forth, turned after every row, the effect is produced even more simply by knitting each row—first from the right side, then from the wrong side. Similar to ribbing , a welting pattern can be specified by the number of knit rows followed by the number of purl rows, e.g., 1x1 welting is garter stitch.
Spool knitting is a traditional way to teach children the basic principles of knitting. According to Mary McCormack, author of Spool Knitting (published in 1909), "Few elementary exercises have aroused more interest in the child than the toy knitting; due, perhaps, to its simplicity and his power to do it easily and well." [2] [3]
In very simple cases, knitting can be done without tools, using only the fingers to do these tasks; however, hand-knitting is usually carried out using tools such as knitting needles or rigid frames. Depending on their size and shape, the rigid frames are called knitting boards, knitting rings (also called knitting looms) or knitting spools ...