1 Is transparent, easily formed and most suitable for window glass (see flat glass). 2  It has a high thermal expansion and poor resistance to heat (500â600 Â°C). 3  It is used for windows, some low temperature incandescent light bulbs, and tableware.
Carson City Mint. The Carson City Mint was a branch of the United States Mint in Carson City, Nevada. It primarily minted low numbers of silver coins; however, gold was also minted in greater numbers. The mint was in operation for about 19 years.
Proof coins are specially produced to a much higher standard of finish. Originally, proofs were intended as pre-production samples. As a printer would produce a small number of proof copies for checking and approval, so a mint would produce proofs for approval by the mintmaster, the monarch, and for other purposes.roof coins are specially produced to a much higher standard of finish. Originally, proofs were intended as pre-production samples. As a printer would produce a small number of proof copies for checking and approval, so a mint would produce proofs for approval by the mintmaster, the monarch, and for other purposes.