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Harrington rods used in spinal fusion. The Harrington rod (or Harrington implant) is a stainless steel surgical device. [1] Historically, this rod was implanted along the spinal column to treat, among other conditions, a lateral or coronal-plane curvature of the spine, or scoliosis. Up to one million people had Harrington rods implanted for ...
A spinning steel wheel provided a good stream of sparks when it engaged the flint, and a tinderbox designed to do this was known as a mill. [10] In a modern lighter or firesteel, iron is mixed with cerium and other rare earths to form the alloy ferrocerium. This readily produces sparks when scraped and burns hotter than steel would.
Iron supplements, also known as iron salts and iron pills, are a number of iron formulations used to treat and prevent iron deficiency including iron deficiency anemia. [ 11 ] [ 12 ] For prevention they are only recommended in those with poor absorption , heavy menstrual periods , pregnancy , hemodialysis , or a diet low in iron.
The Harrington Rod, or Harrington implant, is a device for the straightening of the spine inside the body, designed by Paul Harrington. The device consists of a stainless steel rod, attached to the spine at the top and bottom of the curve with hooks. Attached ratchets are then tightened to distract or straighten the spine.
The chemist Joseph Clutton published an analysis of Ward's pills in A True and Candid Relation of the Good and Bad Effects of Joshua Ward's Pill and Drop in 1736. He found that two of the pills contained antimony and cobalt and the other arsenic. [11] In 1736, Ward set up the Great Vitriol Works in Twickenham to produce sulphuric acid.
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Four magnetic stir bars next to a metre stick. A magnetic stirrer consists of a magnetic bar placed within the liquid which provides the stirring action. The stir bar's motion is driven by another rotating magnet or assembly of electromagnets in the stirrer device, beneath the vessel containing the liquid. [4]
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