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Spirograph is a geometric drawing device that produces mathematical roulette curves of the variety technically known as hypotrochoids and epitrochoids.The well-known toy version was developed by British engineer Denys Fisher and first sold in 1965.
A syringe is a simple reciprocating pump consisting of a plunger (though in modern syringes, it is actually a piston) that fits tightly within a cylindrical tube called a barrel. The plunger can be linearly pulled and pushed along the inside of the tube, allowing the syringe to take in and expel liquid or gas through a discharge orifice at the ...
A hypodermic syringe has the ability to retain liquid and blood in it up to years after the last use and a great deal of caution should be taken to use a new syringe every time. The hypodermic needle also serves an important role in research environments where sterile conditions are required.
A gas syringe has an inner syringe chamber which has a ground glass surface. The syringe barrel also has a ground glass surface. The ground surface of the barrel moves freely within the ground glass surface of the syringe chamber with very little friction. The close mating of these ground glass surfaces also gives a reasonably gas-tight seal. [3]
The Secret City was a television series designed to teach children how to draw. [1] The series was produced by Maryland Public Television and aired on PBS [2] and TVOntario in the late 1980s. The series starred Mark Kistler as Commander Mark who led viewers through various drawing exercises and examples. It also featured other characters ...
Vacutainers have the advantage of being prepared with additives, allowing easy multi-tube draws, and having a lower chance of hemolysis. [18] In developing countries, it is still common to draw blood using a syringe or syringes. Many brands have now started manufacturing Vaccutainer such as Vacu-8, Hemo Tube and Hemo Vac Plus.
Given the options available to Peterson and other addicts mid-century, it’s easy to see why Narcotics Anonymous — founded in 1953 as an offshoot of Alcoholics Anonymous — became such a success. The philosophy of AA co-founder Bill Wilson, also known as Bill W., a former Wall Street analyst and a recovering alcoholic, offered empathy and ...
The insulin syringe was the first syringe that is considered low dead space. It was initially created with low dead space for accurate measuring and mixing of fast and slow acting insulin, which had the added benefit of wasting as little of the expensive drug as possible.
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