Posts Tagged ‘penemu(an)’
Mengenal Thomas Alpha Edison (3)
SiapaBilang-Jan 03 2010 By Mary Bellis, About.com Guide After opening the new laboratory, Edison began to work on the phonograph again, having set the project aside to develop the electric light in the late 1870s. By the 1890s, Edison began to manufacture phonographs for [Read More]
Mengenal Thomas Alpha Edison (1)
SiapaBilang.com-Dec 28 2009 By Mary Bellis Thomas Alva Edison was born on February 11, 1847 in Milan, Ohio; the seventh and last child of Samuel and Nancy Edison. When Edison was seven his family moved to Port Huron, Michigan. Edison lived here until he struck out on his [Read More]
Lighting and Lamps (2 end)
By Mary Bellis, About.com Guide Electric Arc Lamps Sir Humphrey Davy of England invented the first electric carbon arc lamp in 1801. How Arc Lamps Work A carbon arc lamp works by hooking two carbon rods to a source of electricity. With the other ends of the rods spaced at [Read More]
Lighting and Lamps (1)
By Mary Bellis, About.com Guide The first lamp was invented around 70,000 BC. A hollow rock, shell or other natural found object was filled with moss or a similar material that was soaked with animal fat and ignited. Humans began imitating the natural shapes with manmade [Read More]
Adhesives and Glue
By Mary Bellis, About.com Guide Archeologists excavating burial sites from 4000 BC have discovered clay pots repaired with glue made from tree sap. We know that the ancient Greeks developed adhesives for use in carpentry, and created recipes for glue that included the [Read More]
Charles Martin Hall (1863-1914) – Aluminum
By Mary Bellis According to Jefferson Lab, “Scientists suspected than an unknown metal existed in alum as early as 1787, but they did not have a way to extract it until 1825. Hans Christian Oersted, a Danish chemist, was the first to produce tiny amounts of aluminum. [Read More]
