The octant, also called reflecting quadrant, is a measuring instrument used primarily in navigation. It is a type of reflecting instrument.
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Cotton Gin
invented by Eli Whitney
A cotton gin – meaning “cotton engine” – is a machine that…
screw-cutting lathe
invented by Jesse Ramsden
A screw-cutting lathe is a machine (specifically, a lathe) capable of cutting…
Weighing scale
invented by Richard Salter
A scale or balance is a device to measure weight or mass. These are also known…
Smallpox vaccine
invented by Edward Jenner
The smallpox vaccine was the first vaccine to be developed against a contagious…
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