1. Steam Engine — 2023-10-08 00:19:36

   …omen engines operated so slowly that the valves were manually opened and closed by an attendant. An improvement was the replacement of manual operation of the valves with an operation derived from the motion of the engine itself, by lengths of rope kn…

2. Hip Replacement — 2021-08-20 11:18:03

   …Hip Replacement :: === Sir John Charnley 1963 === ~-[[Medical ]]:[[1900s]] {{Databox width="360" Image="JohnCharnley.jpg" class="right…
   …l hip arthroplasty (THA) was carried out by John Charnley in 1963. Before Sir John's work, there had been partial hip replacements, known as hemiarthroplasties. Sir John Charnley, tested materials in his own legs to ensure they worked before implan…
   … joints had worked during the years they had been in the body. == {{datediff from="1963" }} years on == The total hip replacement operation is seen as a landmark in 20th-century surgery, and is now one of the most performed elective surgical procedu…

3. Pencil — 2020-11-30 16:27:31

   …ir sheep. They called it //plaumbago// (lead ore). == Eureka == Soon it was discovered this graphite made an excellent replacement for lead that was used for writing. A cottage industry grew up sawing and shaping the graphite into rods and wrapping i…

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