A balanced-arm lamp, sometimes called a floating arm lamp, is a lamp with an adjustable folding arm which is constructed so that the force due to gravity is always counteracted by springs, regardless of the position of the arms of the lamp. Many lamp brands (such as the Anglepoise, originator of the concept, and Luxo L-1) as well as other devices, such as drawing boards, use this principle.
Read more about Balanced-arm Lamp: Configuration, Lamps Balanced With Springs, Lamps Balanced By Pressure and Friction, Lamps Balanced With One Counterweight, Lamps Balanced With Two Counterweights, Lamps Using Other Systems, In Popular Culture
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