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First African-American woman to earn a PhD in physics (University of Michigan Ann Arbor 1972) on vibrational analysis of secondary chlorides [147] Morgan, Garrett: 1877–1963 Inventor Invented an early version of a gas mask called a smoke hood, and created the first traffic light that included a third "warning" position which is standard today ...
Shadoof or shaduf comes from the Arabic word شادوف, šādūf. It is also called a lift, [4] well pole, well sweep, or simply a sweep in the US. [2] A less common English translation is swape. [3] Picotah (or picota) is a Portuguese loan word. It is also called a jiégāo (桔槹) in Chinese.
It was invented by American scientist Joseph Henry in 1831. [64] 1831 Doorbell (electric) A doorbell is a signaling device commonly found near a door. It commonly emits a ringing sound to alert the occupant of the building to a visitor's presence. The electric doorbell was invented by Joseph Henry in 1831. [25] [65] 1833 Sewing machine (lock ...
Ruby ring. A ring is a round band, usually made of metal, worn as ornamental jewelry.The term "ring" by itself denotes jewellery worn on the finger; when worn as an ornament elsewhere, the body part is specified within the term, e.g., earrings, neck rings, arm rings, and toe rings.
1526. The first African slaves in what would become the present day United States of America arrived on August 9, 1526, in Winyah Bay, South Carolina. Spanish explorer Lucas Vázquez de Ayllón led around six hundred settlers, including an unknown number of African slaves, in an attempt to start a colony.
A class ring in a ring case. This ring is made of white ultrium and contains a synthetic sapphire gemstone. [1] Damavand College class ring of 1975. In the United States and Canada, a class ring (also known as a graduation, graduate, senior, or grad ring) is a ring worn by students and alumni to commemorate their final academic year and/or graduation, generally for a high school, college, or ...
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The iron bit, also referred to as a gag, was used by enslavers and overseers as a form of punishment on slaves in the Southern United States. The bit, sometimes depicted as the scold's bridle, uses similar mechanics to that of the common horse bit.