Portland cement is the most common type of cement in general use around the world as a basic ingredient of concrete, mortar, stucco, and non-specialty grout. It was developed from other types of hydraulic lime in England in the early 19th century by Joseph Aspdin, and is usually made from limestone. It is a fine powder, produced by heating limestone and clay minerals in a kiln to form clinker, grinding the clinker, and adding 2 to 3 percent of gypsum.
invented by Elisha Otis
An elevator (North American English)[1] or lift (Commonwealth English)[2] is a…
invented by John Kemp Starley
A safety bicycle (or simply a safety) is a type of bicycle that became very…
invented by Karl Von Drais
The dandy horse, a derogatory term for what was first called a Laufmaschine (in…
invented by Clément Ader
“Eole” redirects here. For the racehorse, see Eole (horse) .The…
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