When did people stop making glass records!?!? plzz answer!!!........10 pts!?

Question: When did people stop making glass records!!?!!? plzz answer!!!!.!.!.!.!.!.!.!.10 pts!!?
Best Answer - Chosen by Asker:

It seems that glass record production was a temporary stop gap during World War 2 and that after the war records were made of vinyl or polystyrene!. After the war, records were no longer made of glass!.

BACKGROUND HISTORY
On November 8 1887, Emile Berliner, a German immigrant working in Washington D!.C!., patented a successful system of sound recording!. Berliner was the first inventor to stop recording on cylinders and start recording on flat disks or records!. The first records were made of glass, later zinc, and eventually plastic!.
http://inventors!.about!.com/od/gstartinve!.!.!.

WORLD WAR II
During the Second World War acetate - like steel, rubber, practically any metal - was commandeered for war purposes!. So we had to use 16" wide glass records - a perilous undertaking as I well remember going through factories in the Midwest to record war workers and banging over dirt roads in Alabama to record the incomparable voices of black cotton croppers!.
http://news!.bbc!.co!.uk/2/hi/programmes/le!.!.!.

Regarding glass records: they were lacquer discs that had a clear glass core!. They were "instantaneous" discs, meaning that they were supplied as blanks intended for on-the-spot recording!. The lacquer into which the grooves were cut was a black layer applied on top of the glass!. (I own some!.) They were for professional and private use
only!. It's been my understanding that the glass was used during World War II because of the shortages of other "core" materials due to the war effort!.
http://newsgroups!.derkeiler!.com/Archive/!.!.!.

POST WAR
In February 1949, RCA Victor released the first 45 rpm single, 7 inches in diameter, with a large center hole to accommodate an automatic play mechanism on the changer, so a stack of singles would drop down one record at a time automatically after each play!. Early 45 rpm records were made from either vinyl or polystyrene!.
http://en!.wikipedia!.org/wiki/Gramophone_!.!.!.

Someone on a forum mentioned that there was a Kate Smith glass record being sold for $50,000 on Ebay!. I don't know if they got that price!Www@QuestionHome@Com

I can't find any mention of glass being used as a recording medium; however vinyl records had replaced the 78-rpm recordings on pressed shellac by the end of the 1950s!.Www@QuestionHome@Com

Yes exactly vinyl replaced shellac when the LP was introduced!. The 78s were very breakable because the were shellac!.Www@QuestionHome@Com