Edison in 1902 started to Gold Mould cylinders, this process uses a oversized groove and a large wax master. The master is placed in a vacuum with 2 pieces of gold leaf. High voltage is introduced to the gold leaf in the bell jar, and vaporizes...
"Circa 1885
The Bilhorn, folding portable organ was invented by Peter Philip Bilhorn around 1885. Peter Bilhorn was an evangelist singer and composer who invented the portable organ for his evangelistic activities. He and his brother founded the...