A watch is a portable timepiece intended to be carried or worn by a person. It is designed to keep a consistent movement despite the motions caused by the person’s activities. A wristwatch is designed to be worn around the wrist, attached by a watch strap or other type of bracelet, including metal bands, leather straps or any other kind of bracelet. A pocket watch is designed for a person to carry in a pocket, often attached to a chain.
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invented by Humphry Davy
An arc lamp or arc light is a lamp that produces light by an electric arc (also…
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invented by James Nasmyth
A steam hammer, also called a drop hammer, is an industrial power hammer driven…
Crookes radiometer
invented by Sir William Crookes
The Crookes radiometer (also known as a light mill) consists of an airtight…
Relay
invented by Joseph Henry
A relay is an electrically operated switch. It consists of a set of input…
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