Introduction
The electric light bulb, also known as the incandescent lamp, is used to provide light. It consists of a brass or aluminium base having either a screw thread or two small pins projecting from its base. These are used to secure the lamp into a socket. The metal base of the bulb, called a base shell is a hollow cup. Rising from the base shell is a hollow glass tube known as a stem press. Sealed into the stem press are two thin wires that run from the base to the upper part of the lamp. On top of the stem press is a thin solid piece of glass known as the button rod. On the top of the rod is a flat glass button.
Sealed into this button is a very fine wire. This wire and the two that come from the stem press support a coil of fine wire known as a filament. The ends of the filament are connected to the ends of the two wires that come from the base shell through the stem press. All this is contained within a hollow glass bulb which tapers into a neck and is sealed at the base shell.
1.1 How does it work ?
1.2 Where did they come from ?
1.3 Other forms of lighting
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