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In the form of γ-anhydrite (the anhydrous form), it is used as a desiccant. One particular hydrate is better known as plaster of Paris, and another occurs naturally as the mineral gypsum. It has many uses in industry. All forms are white solids that are poorly soluble in water. [5] Calcium sulfate causes permanent hardness in water.
He received his commission as medical officer 3d class in the Royal Netherlands Army in 1828. In 1838 he participated in the 10-day war of Belgian Revolution.. While working in Haarlem at the military hospital in 1851, Mathijsen first used plaster of Paris as a bandage. [1]
Because plaster of Paris sets quickly, "retardants" were used to slow setting time enough to allow workers to mix large working quantities of lime putty plaster. A modern form of this method uses expanded metal mesh over wood or metal structures, which allows a great freedom of design as it is adaptable to both simple and compound curves.
Gypsum mortar, also called plaster of Paris, was used in the construction of many ancient structures. It is made from gypsum, which requires a lower firing temperature. It is therefore easier to make than lime mortar and sets up much faster, which may be a reason it was used as the typical mortar in ancient, brick arch and vault construction.
The use of scagliola declined in the 20th century. [3] Scagliola is a composite substance made from plaster of Paris, glue and natural pigments, imitating marble and other hard stones. The material may be veined with colors and applied to a core, or desired pattern may be carved into a previously prepared scagliola matrix.
The word gypsum is derived from the Greek word γύψος (gypsos), "plaster". [9] Because the quarries of the Montmartre district of Paris have long furnished burnt gypsum (calcined gypsum) used for various purposes, this dehydrated gypsum became known as plaster of Paris. Upon adding water, after a few dozen minutes, plaster of Paris becomes ...
This was inspired by the plaster of Paris she used in her sculptural work. The anatomically correct papier mâché splint reduced the healing time while properly supporting the broken limb. The idea of using plaster of Paris was adopted and refined over the years and is still in use today by the medical profession. [10]
The end of the Roman Empire in the west, and the creation of the Merovingian dynasty in the 5th century, with its capital placed in Paris by Clovis I, confirmed the new role and name for the city. The adjective Parisiacus had already been used for centuries. Lutetia had gradually become Paris, the city of the Parisii. [22]