polished$62087$ - ορισμός. Τι είναι το polished$62087$
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Τι (ποιος) είναι polished$62087$ - ορισμός

Polished plate

Polished plate glass         
Polished plate is a type of hand-made glass. It is produced by casting glass onto a table and then subsequently grinding and polishing the glass.
Turned, ground, and polished         
FINISHING PROCESS FOR METAL SHAFTING
Turned, Ground, and Polished; Turned, ground and polished
Turned, ground, and polished (TGP) is a classification of finishing processes often used for metal shafting. Turning (on a lathe) creates straight round bars without the strain induced by cold drawing, while grinding and polishing improves the surface finish and roundness for high dimensional accuracy.
Drawn, ground, and polished         
FINISHING PROCESS FOR METAL SHAFTING
Drawn, Ground, and Polished; Drawn, ground and polished
Drawn, ground, and polished (DGP) is a classification of finishing processes often used for metal shafting. Cold drawing increases the metal's strength, while grinding and polishing improves the surface finish and roundness for high dimensional accuracy.

Βικιπαίδεια

Polished plate glass

Polished plate is a type of hand-made glass. It is produced by casting glass onto a table and then subsequently grinding and polishing the glass. This was originally done by hand, and then later by machine. It was an expensive process requiring a large capital investment.

Other methods of producing hand-blown window glass included: broad sheet, blown plate, crown glass and cylinder blown sheet. These methods of manufacture lasted at least until the end of the 19th century. The early 20th century marks the move away from hand-blown to machine manufactured glass such as rolled plate, machine drawn cylinder sheet, flat drawn sheet, single and twin ground polished plate, and float glass.

The Frenchman, Louis Lucas de Nehou, in 1688, in conjunction with Abraham Thevart, succeeded in perfecting the process of casting plate-glass. Mirror plates previous to the invention had been made from blown "sheet" glass, and were consequently very limited in size. De Nehou's process of rolling molten glass poured on an iron table rendered the manufacture of very large plates possible.

In 1773 English polished plate (by the French process) was produced at Ravenhead.

By 1800 a steam engine was used to carry out the grinding and polishing of the cast glass.