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21st-century hunting compound crossbow. A crossbow is a ranged weapon using an elastic launching device consisting of a bow-like assembly called a prod, mounted horizontally on a main frame called a tiller, which is hand-held in a similar fashion to the stock of a long gun. Crossbows shoot arrow-like projectiles called bolts or quarrels.
Trellis in the courtyard of the Wernberg monastery, Wernberg, Carinthia, Austria. A trellis (treillage) is an architectural structure, usually made from an open framework or lattice of interwoven or intersecting pieces of wood, bamboo or metal that is normally made to support and display climbing plants, especially shrubs. [1]
Benzalkonium chloride (BZK, BKC, BAK, BAC), also known as alkyldimethylbenzylammonium chloride (ADBAC) and by the trade name Zephiran, [1] is a type of cationic surfactant. It is an organic salt classified as a quaternary ammonium compound. ADBACs have three main categories of use: as a biocide, a cationic surfactant, and a phase transfer agent ...
Hydroxysultaine is prepared industrially by the reaction of sodium bisulfite with epichlorohydrin to give the sodium salt (sodium 1-chloro-2-hydroxypropane sulfonate). [1] This is similar to the synthesis of isethionate , which is also used as a 'head-group' in surfactants.
Triton X-100 (C 14 H 22 O(C 2 H 4 O) n) is a nonionic surfactant that has a hydrophilic polyethylene oxide chain (on average it has 9.5 ethylene oxide units) and an aromatic hydrocarbon lipophilic or hydrophobic group. The hydrocarbon group is a 4-(1,1,3,3-tetramethylbutyl)-phenyl group.
As long as the lath and the first coats (brown coat) of plaster do not have any significant damage, minor cracks can simply be patched. For larger cracks, and when the brown coat is damaged, several base coats need to be applied prior to the patch coat. Metal lath can also be added to wooden lath prior to coating to add strength and increase ...
When it is used vertically to provide support to the vegetable trellis, the netting is fastened to a line of posts or supports (metal, bamboo or wood) distanced from 1.5 to up to 8 meters (depending to the type of crop, soil type, climate etc.) where the furrow ends have posts that are larger and stronger and preferably have a tension string or ...
The crossbow as a weapon had been around long before Leonardo's designs. However, his designs made the weapon more advanced and why Leonardo's crossbows stands out. If a crossbow is designed with a narrower shaft and a tapered bolt, which adjusts the nocking of arrows, it greatly improves the airflow of the bow and the drag on arrows.
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