Blown plate was made by hand-grinding
broad sheet glass. As the process was labour-intensive, and expensive, blown plate was mainly used for
carriages and
mirrors rather than in
windows for buildings. Other methods for making hand-blown glass included:
broad sheet,
crown glass,
polished plate and
cylinder blown sheet. These methods of manufacture lasted at least until the end of the 19th century. The early 20th century marked 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. ==References==