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Errett Callahan was born in Lynchburg, Virginia, on December 17, 1937.Callahan’s interest in the outdoors and Native American lifeways began quite early on. As a boy Callahan was a member of the Boy Scouts of America and it was as a Boy Scout that he was first exposed to the skills and techniques that the Native Americans used to survive in the outdoors. [1]
Scalpel blade injuries were among the most frequent sharps injuries, second only to needlesticks. Scalpel injuries made up 7 percent to 8 percent of all sharps injuries in 2001. [12] [13] "Scalpel Safety" is a term coined to inform users that there are choices available to them to ensure their protection from this common sharps injury. [14]
420 series contains several types with various carbon content between 0.15% and 0.40% this steel grade is widely used to make high-end razor blades, surgical scalpels, etc. It obtains about 57 HRC after suitable heat treatment. 420HC (420C) is a higher carbon content 420 stainless steel.
Obsidian can be used to make extremely sharp knives, and obsidian blades are a type of glass knife made using naturally occurring obsidian instead of manufactured glass. Obsidian is used by some surgeons for scalpel blades, although this is not approved by the US Food and Drug Administration (FDA) for use on humans. [ 61 ]
The analysis of obsidian debitage can reveal whether or not prismatic blade production occurred at a site and, if it had, what stages of production the process included. In other words, the types of manufacturing waste present (e.g., rejuvenation flakes and/or blades, platform rejuvenation flakes, etc.) at a site can inform archaeologists about ...
Despite being sharper, prismatic obsidian is also considerably more brittle than steel; obsidian blades of the type used on the macuahuitl tended to shatter on impact with other obsidian blades, steel swords or plate armour. Obsidian blades also have difficulty penetrating European mail. The thin, replaceable blades used on the macuahuitl were ...
Its teeth and eyes were accented with inlaid white flint and obsidian, a volcanic rock. As it is a sacred sacrificial knife it is symbolically related to Mictlan, the lower part of the universe where the emaciated beings live . Mictlan was associated with the color black and the tecpatl (sacrificial knife).
[30] [33] [34] [35] Cheap stainless steel straight razors from Asia and more expensive stainless steel and carbon steel razors from Europe are available. A razor blade starts as a shape called the blank supplied by the steel manufacturer.