1. Steam Engine — 2023-10-08 00:19:36

   …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. Portland Cement — 2023-10-08 00:16:46

   … Recipe for Success == The specifications for the new cement read: a very pure limestone was to be burned to lime, the lime mixed with a definite quantity of clay, and the mixture …
   …then calcined in a vertical kiln and finally the calcine was to be powdered. /* event_date="21 October 1824" Portland cement is patented */ He obtained the patent for Portland cement on 21 October 1824 for ** An Improvement in the Mode of Prod…
   ….jpg" class="right" title="Aspdin Blue Plaque" width="300" }} == A Classic Title == Aspdin called the product Portland cement because when set, it resembled '**Portland stone**', a limestone that is quarried on the Isle of Portland off the Briti…
   …fine buildings and cathedrals use the fine stone. With this invention, Aspdin laid the foundation for today's portland cement industry. == Today == ||{{Image url="Cn-tower4.jpg" title="CN Tower" width="200" }}||{{Image url="Runway.jpg" title="R…

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

   …Hip Replacement :: === Sir John Charnley 1963 === ~-[[Medical ]]:[[1900s]] {{Databox width="360" Image="JohnCharnley.jpg" class="right…
   … 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…
   …ts 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…

4. Pencil — 2020-11-30 16:27:31

   …eep. 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…

5. Reinforced Concrete — 2020-08-17 08:53:02

   …rcing" width="500" }} He used iron bars and wire rope to reinforce the concrete based on broken coke, sand and Portland cement in the floors of a two-story cottage he was building for his servants. The method proved successful. He patented his in…

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