A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.
invented by Patrick Bell
A reaper is a farm implement or person that reaps (cuts and often also gathers)…
invented by Alessandro Volta
The voltaic pile was the first electrical battery that could continuously…
invented by Paul Vieille
Poudre B was the first practical smokeless gunpowder created in 1884. It was…
invented by James Nasmyth
A steam hammer, also called a drop hammer, is an industrial power hammer driven…
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