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 William Otis
A steam shovel is a large steam-powered excavating machine designed for lifting…
invented by Hiram Maxim
The Maxim gun is a recoil-operated machine gun invented in 1884 by Hiram…
invented by James Beaumont Neilson
Hot blast refers to the preheating of air blown into a blast furnace or other…
invented by J. Clark J.E.T. Woods
Stainless steel 276 is a group of ferrous alloys that contain a minimum of…
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