Philip B. Downing was the African-American inventor of the public mailbox, a metal box on four legs with an outer door and an inner safety door. He called it a street letter box and intended it to be used instead of the post office.Know More
Downing patented his mailbox on Oct. 27, 1891. Before 1891, safety was not guaranteed in public mailboxes because they were typically left half-open. With Downing's invention, the inner safety door ensured the protection of mail from theft and adverse weather conditions.
In 1890, Downing patented a railway switch controlling the power supply to trains. Residential electrical switches were later invented based on this design.Learn more about Inventions
Niccolo Niccoli is credited by many scholars as the inventor of modern cursive, according to the Chicago Tribune. Niccoli's cursive is known as "italic" and does not feature elaborate curly-cues.Full Answer >
Isaac R. Johnson is recognized as the inventor of a patented form for a folding bicycle frame that is recognizable as the common contemporary bicycle. However, few records exist of his life. He is famous for being a black inventor in the United States before the equal rights movements occurred. He patented his invention on Oct. 10, 1899.Full Answer >
Martin Ohm is considered to be the golden ratio inventor, according to MathWorld, as he first used the term "golden section" in 1835. The golden ratio is a value such that x / 1 = 1 / (1 - x).Full Answer >
Heinrich Goebel, a German inventor and mechanic, patented three inventions, including a sewing machine hemmer improvement, a Geissler system of vacuum pumps improvement and an electric incandescent lamp. The lamp patent was actually an improvement for existing bulbs, consisting of sockets to connect the carbon filament and conducting wires.Full Answer >