The first commercially available light bulb cost $1 in 1881, which was three years after Thomas Edison developed the first practical incandescent light bulb. The Seattle Times reveals the $1 price in 1881 translates to $23 in 2013. By 1910, the cost of a light bulb dropped to 17 cents.
Edison created the Edison Electric Light Company in 1880 to market his new invention. By 1910, longer-lasting tungsten filaments made light bulbs cheaper. Compact fluorescent lights (CFL) saw similar declines in price from the 1980s to 2013. The first models in the mid-1980s each cost between $25 to $35 before going down in price to $1.74 apiece in 2013.Learn More
Although earrings developed over time rather than being a product of invention, they were first worn in ancient Middle Eastern cultures. The oldest earrings existed in ancient Persia.Full Answer >
Pen ink is made from dyes that are suspended or dissolved in solvents, making it very similar to paint. The first inks were vegetable or fruit juices and the protective secretions from squid, octopus and cuttlefish. Black ink is made from carbon black and uses white pigments like titanium dioxide.Full Answer >
During the 1820s, Charles Babbage invented the difference engine, a machine that was capable of making mathematical calculations. Babbage also invented the analytical engine, which was a machine that could read punch cards to perform arithmetical calculations and had a built-in memory unit for storing numbers.Full Answer >
John Standard improved the refrigerator by implementing a manually filled ice chamber for chilling. He registered his patent for an improved refrigerator design on June 14, 1891.Full Answer >