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An arc lamp or arc light is the general term for a class of lamps that produce light by an electric arc (also called a voltaic arc). The lamp consists of two electrodes typically made of tungsten which are separated by a gas.

Arc Light

An arc lamp or arc light is the general term for a class of lamps that produce light by an electric…

Tungsten incandescent lamp.

Electric Light, Tungsten Incandescent Lamp

Tungsten incandescent lamp.

Also known as Stolzite, this crystal is bounded by the unit pyramid of the first order, P, {111} (o), and by the prism of the third order, (p).

Lead Tungstate

Also known as Stolzite, this crystal is bounded by the unit pyramid of the first order, P, {111} (o),…